{"id":6191,"date":"2026-09-28T06:24:08","date_gmt":"2026-09-28T06:24:08","guid":{"rendered":"https:\/\/tervina-eg.com\/en\/?page_id=6191"},"modified":"2026-09-28T06:24:08","modified_gmt":"2026-09-28T06:24:08","slug":"pump-selector-calculator","status":"publish","type":"page","link":"https:\/\/tervina-eg.com\/en\/pump-selector-calculator\/","title":{"rendered":"Pump Selector Calculator"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"6191\" class=\"elementor elementor-6191\" data-elementor-settings=\"[]\">\n\t\t\t<div class=\"elementor-inner\">\n\t\t\t\t<div class=\"elementor-section-wrap\">\n\t\t\t\t\t\t\t<section class=\"elementor-element elementor-element-1c27b9c elementor-section-boxed elementor-section-height-default elementor-section-height-default elementor-section elementor-top-section\" data-id=\"1c27b9c\" data-element_type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t<div 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.tvn-ps-main{margin:-35px 12px 18px}#tvn-ps-74491 .tvn-ps-form{padding:18px}#tvn-ps-74491 .tvn-ps-grid{grid-template-columns:1fr}#tvn-ps-74491 .tvn-ps-deepwell-fields{grid-template-columns:1fr}#tvn-ps-74491 .tvn-ps-result-card{grid-template-columns:82px 1fr;gap:10px}#tvn-ps-74491 .tvn-ps-image{height:70px}#tvn-ps-74491 .tvn-ps-stat{padding-top:6px;border-top:1px solid #edf0f4}#tvn-ps-74491 .tvn-ps-status{grid-column:1\/-1;min-height:58px;flex-direction:row;gap:8px}#tvn-ps-74491 .tvn-ps-status-icon{margin:0}#tvn-ps-74491 .tvn-ps-details{margin-left:10px} }\n        <\/style>\n\n        <div class=\"tvn-ps-hero\">\n            <p class=\"tvn-ps-kicker\">VAMA WATER TECHNOLOGY<\/p>\n            <h2 class=\"tvn-ps-title\">Pump Selector Calculator<\/h2>\n            <p class=\"tvn-ps-subtitle\">Enter the required flow and head, and the calculator will show you the approved models closest to that operating point.<\/p>\n        <\/div>\n\n        <div class=\"tvn-ps-main\">\n            <div class=\"tvn-ps-card tvn-ps-form\">\n                <div class=\"tvn-ps-form-head\">\n                    <div class=\"tvn-ps-icon\">\u2301<\/div>\n                    <div><strong>Calculator<\/strong><span>Enter your system requirement<\/span><\/div>\n                <\/div>\n\n                <div class=\"tvn-ps-grid\">\n                    <div class=\"tvn-ps-field\">\n                        <label>Pump Type<\/label>\n                        <select class=\"tvn-ps-input tvn-ps-category\">\n                            <option value=\"surface\">Swimming<\/option>\n                            <option value=\"domestic\">Domestic Pumps<\/option>\n                            <option value=\"submersible\">Submersible<\/option>\n                            <option value=\"multistage\">Multistage<\/option>\n                            <option value=\"deepwell\">Deep Well<\/option>\n                        <\/select>\n                        <p class=\"tvn-ps-help\">Choose the required pump type<\/p>\n                    <\/div>\n                    <div class=\"tvn-ps-field\">\n                        <label>Required Flow<\/label>\n                        <div class=\"tvn-ps-number has-unit-select\">\n                            <input type=\"number\" step=\"0.1\" min=\"0\" class=\"tvn-ps-input tvn-ps-flow\" placeholder=\"e.g. 15\">\n                            <select class=\"tvn-ps-unit-select tvn-ps-flow-unit\" aria-label=\"Flow unit\" title=\"Click to choose the flow unit\">\n                                <option value=\"m3h\">m\u00b3 \/ hour<\/option>\n                                <option value=\"lpm\">L \/ min<\/option>\n                            <\/select>\n                        <\/div>\n                        <p class=\"tvn-ps-help\"><span class=\"tvn-ps-flow-hint\">Unit: cubic meters \/ hour \u2014 click the \u25be arrow if you need L\/min<\/span> <span class=\"tvn-ps-conv\"><\/span><\/p>\n                    <\/div>\n                    <div class=\"tvn-ps-field\">\n                        <label>Required Head<\/label>\n                        <div class=\"tvn-ps-number\"><input type=\"number\" step=\"0.1\" min=\"0\" class=\"tvn-ps-input tvn-ps-head\" placeholder=\"e.g. 12\"><span class=\"tvn-ps-unit\">m<\/span><\/div>\n                        <p class=\"tvn-ps-help\">Total head in meters<\/p>\n                    <\/div>\n                    <div class=\"tvn-ps-field\">\n                        <button class=\"tvn-ps-search\" type=\"button\">\u2315 &nbsp; Search for suitable pumps<\/button>\n                        <p class=\"tvn-ps-help\">Results are based on approved data only<\/p>\n                    <\/div>\n                <\/div>\n\n                <div class=\"tvn-ps-well tvn-ps-field\">\n                    <label>Available well diameter (inches)<\/label>\n                    <select class=\"tvn-ps-input tvn-ps-well-diameter\"><option value=\"4\">4&quot;<\/option><option value=\"5\">5&quot;<\/option><option value=\"6\">6&quot;<\/option><option value=\"8\">8&quot;<\/option><option value=\"10\">10&quot;<\/option><\/select>\n                <\/div>\n\n                <div class=\"tvn-ps-deepwell-fields\" style=\"display:none;margin-top:16px\">\n                    <div class=\"tvn-ps-field\">\n                        <label>Dynamic water level while running (m)<\/label>\n                        <p class=\"tvn-ps-help\">Depth of water from ground level while the pump is running.<\/p>\n                        <div class=\"tvn-ps-number\"><input type=\"number\" step=\"0.1\" min=\"0\" class=\"tvn-ps-input tvn-ps-dynamic-level\" placeholder=\"e.g. 60\"><span class=\"tvn-ps-unit\">m<\/span><\/div>\n                    <\/div>\n                    <div class=\"tvn-ps-field\">\n                        <label>Delivery point height (m)<\/label>\n                        <p class=\"tvn-ps-help\">Height from ground level to where the water needs to reach.<\/p>\n                        <div class=\"tvn-ps-number\"><input type=\"number\" step=\"0.1\" min=\"0\" class=\"tvn-ps-input tvn-ps-delivery-height\" placeholder=\"e.g. 10\"><span class=\"tvn-ps-unit\">m<\/span><\/div>\n                    <\/div>\n                    <div class=\"tvn-ps-field\">\n                        <label>Required pressure at the outlet (bar)<\/label>\n                        <p class=\"tvn-ps-help\">The required pressure at the water outlet point or end of the network.<\/p>\n                        <div class=\"tvn-ps-number\"><input type=\"number\" step=\"0.1\" min=\"0\" class=\"tvn-ps-input tvn-ps-pressure\" placeholder=\"e.g. 2\"><span class=\"tvn-ps-unit\">bar<\/span><\/div>\n                    <\/div>\n                    <div class=\"tvn-ps-field\">\n                        <label>Pipe losses (m)<\/label>\n                        <p class=\"tvn-ps-help\">Losses from water friction inside the pipes and fittings.<\/p>\n                        <div class=\"tvn-ps-number\"><input type=\"number\" step=\"0.1\" min=\"0\" value=\"0\" class=\"tvn-ps-input tvn-ps-pipe-loss\" placeholder=\"e.g. 8\"><span class=\"tvn-ps-unit\">m<\/span><\/div>\n                    <\/div>\n                    <div class=\"tvn-ps-note tvn-ps-tdh-note\" style=\"margin-top:14px\"><b>How total head (TDH) is calculated<\/b><span>Dynamic water level + delivery point height + (pressure \u00d7 10.197) + pipe losses.<\/span><\/div>\n                <\/div>\n                <div class=\"tvn-ps-message tvn-ps-error\"><\/div>\n            <\/div>\n\n            <div class=\"tvn-ps-results-layout tvn-ps-results-area\" style=\"display:none\">\n                <div class=\"tvn-ps-card tvn-ps-results\">\n                    <div class=\"tvn-ps-results-head\"><strong class=\"tvn-ps-results-count\">Results<\/strong><span>Sorted by closest match<\/span><\/div>\n                    <div class=\"tvn-ps-chart\">\n                        <div style=\"display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap\">\n                            <p class=\"tvn-ps-chart-title\" style=\"margin:0\">Pump Performance Curve (Flow \/ Head)<\/p>\n                            <button type=\"button\" class=\"tvn-ps-showall\" style=\"display:none\">Show all curves<\/button>\n                        <\/div>\n                        <p class=\"tvn-ps-chart-sub\">Hover over any curve to see that pump's details at any flow \u2014 click a model in the list below to show its curve alone.<\/p>\n                        <div class=\"tvn-ps-chart-legend\"><\/div>\n                        <div class=\"tvn-ps-chart-box\"><svg><\/svg><div class=\"tvn-ps-chart-tip\"><\/div><\/div>\n                        <p class=\"tvn-ps-chart-note\"><\/p>\n                    <\/div>\n                    <div class=\"tvn-ps-list tvn-ps-result-list\"><\/div>\n                <\/div>\n                <aside class=\"tvn-ps-side\">\n                    <h3>How does the calculator work?<\/h3>\n                    <div class=\"tvn-ps-step\"><div class=\"tvn-ps-step-num\">1<\/div><div><strong>Select the pump type<\/strong><span>Choose the appropriate product group.<\/span><\/div><\/div>\n                    <div class=\"tvn-ps-step\"><div class=\"tvn-ps-step-num\">2<\/div><div><strong>Enter the flow and head<\/strong><span>Choose the flow unit (m\u00b3\/hour or L\/min) and enter the required operating point.<\/span><\/div><\/div>\n                    <div class=\"tvn-ps-step\"><div class=\"tvn-ps-step-num\">3<\/div><div><strong>See the suitable models<\/strong><span>We'll show the approved models that meet the operating point.<\/span><\/div><\/div>\n                <\/aside>\n            <\/div>\n\n            <div class=\"tvn-ps-note\"><b>Note:<\/b> each model's image in the results is pulled automatically from the <b>Series product image<\/b> in Products. If the same Series has several models, all models will use the same image without uploading it again.<\/div>\n        <\/div>\n    <\/section>\n    <script>\n    (function(){\n        var root=document.getElementById('tvn-ps-74491');\n        if(!root) return;\n        var TVN_DATA={\"surface\":{\"label\":\"Swimming\",\"products\":[{\"model\":\"SBP35\",\"hp\":0.34999999999999997779553950749686919152736663818359375,\"kw\":0.25,\"ampere\":1.600000000000000088817841970012523233890533447265625,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,3,6,9],\"head\":[7.5,7,6,4]},\"entry_unit\":\"m3h\",\"image_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/\\u0645\\u0648\\u062f\\u064a\\u0644\\u0627\\u062a-SBP-300x300.webp\",\"product_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/products\\\/vama-sbp-high-efficiency-swimming-pool-pump-series\\\/\"},{\"model\":\"SBP50\",\"hp\":0.5,\"kw\":0.36999999999999999555910790149937383830547332763671875,\"ampere\":2,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,3,6,9,12],\"head\":[9,8.5,7.5,6,3]},\"entry_unit\":\"m3h\",\"image_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/\\u0645\\u0648\\u062f\\u064a\\u0644\\u0627\\u062a-SBP-300x300.webp\",\"product_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/products\\\/vama-sbp-high-efficiency-swimming-pool-pump-series\\\/\"},{\"model\":\"SBP75\",\"hp\":0.75,\"kw\":0.5500000000000000444089209850062616169452667236328125,\"ampere\":3.20000000000000017763568394002504646778106689453125,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,3,6,9,12,15],\"head\":[11,10.5,9.5,8,6,3.5]},\"entry_unit\":\"m3h\",\"image_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/\\u0645\\u0648\\u062f\\u064a\\u0644\\u0627\\u062a-SBP-300x300.webp\",\"product_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/products\\\/vama-sbp-high-efficiency-swimming-pool-pump-series\\\/\"},{\"model\":\"SBP100\",\"hp\":1,\"kw\":0.75,\"ampere\":3.79999999999999982236431605997495353221893310546875,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,3,6,9,12,15,18],\"head\":[14.5,13.5,12,10.5,8.5,6,3]},\"entry_unit\":\"m3h\",\"image_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/\\u0645\\u0648\\u062f\\u064a\\u0644\\u0627\\u062a-SBP-300x300.webp\",\"product_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/products\\\/vama-sbp-high-efficiency-swimming-pool-pump-series\\\/\"},{\"model\":\"SBP120\",\"hp\":1.1999999999999999555910790149937383830547332763671875,\"kw\":0.90000000000000002220446049250313080847263336181640625,\"ampere\":4.5999999999999996447286321199499070644378662109375,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,3,6,9,12,15,18],\"head\":[15.5,14.5,13.5,12.5,10,8,5]},\"entry_unit\":\"m3h\",\"image_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/\\u0645\\u0648\\u062f\\u064a\\u0644\\u0627\\u062a-SBP-300x300.webp\",\"product_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/products\\\/vama-sbp-high-efficiency-swimming-pool-pump-series\\\/\"},{\"model\":\"SBP150\",\"hp\":1.5,\"kw\":1.100000000000000088817841970012523233890533447265625,\"ampere\":5.79999999999999982236431605997495353221893310546875,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,3,6,9,12,15,18,21],\"head\":[17.5,17,16.5,15.5,14,12,8.5,3.5]},\"entry_unit\":\"m3h\",\"image_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/\\u0645\\u0648\\u062f\\u064a\\u0644\\u0627\\u062a-SBP-300x300.webp\",\"product_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/products\\\/vama-sbp-high-efficiency-swimming-pool-pump-series\\\/\"},{\"model\":\"48sup\",\"hp\":1.5,\"kw\":1.100000000000000088817841970012523233890533447265625,\"ampere\":5.20000000000000017763568394002504646778106689453125,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,6,12,18,24],\"head\":[17,16,14,11,7]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"SCP100\",\"hp\":1,\"kw\":0.75,\"ampere\":3.79999999999999982236431605997495353221893310546875,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,2.5,5,7.5,10,12.5,15,17.5],\"head\":[11,10.800000000000000710542735760100185871124267578125,10,9,8,7.5,6,4.5]},\"entry_unit\":\"m3h\",\"image_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/wp-content\\\/uploads\\\/2026\\\/09\\\/scp-300x300.webp\",\"product_url\":\"https:\\\/\\\/tervina-eg.com\\\/en\\\/products\\\/vama-scp-high-performance-swimming-pool-pump-series\\\/\"},{\"model\":\"SCP150\",\"hp\":1.5,\"kw\":1.100000000000000088817841970012523233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Well\",\"products\":[{\"model\":\"QJD2-35\\\/6\",\"hp\":0.5,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5],\"head\":[38,36,35,30,23,15]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"QJD2-45\\\/8\",\"hp\":0.75,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5],\"head\":[52,50,45,40,35,25]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"QJD2-60\\\/11\",\"hp\":1,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5,6],\"head\":[70,65,60,52,40,29,10]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"QJD2-90\\\/16\",\"hp\":1.5,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5],\"head\":[104,98,90,80,68,44]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"100QJD-125\\\/22\",\"hp\":2,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5],\"head\":[140,135,125,114,94,68]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"QJD2-180\\\/28\",\"hp\":3,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5],\"head\":[195,180,165,130,85,25]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"QJD2-45\\\/8\",\"hp\":0.75,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5],\"head\":[52,50,45,40,35,25]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"QJD2-60\\\/11\",\"hp\":1,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5,6],\"head\":[70,65,60,52,40,29,10]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"QJD2-90\\\/16\",\"hp\":1.5,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5],\"head\":[104,98,90,80,68,44]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"100QJD-125\\\/22\",\"hp\":2,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5],\"head\":[140,135,125,114,94,68]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"},{\"model\":\"QJD2-180\\\/28\",\"hp\":3,\"kw\":null,\"ampere\":null,\"voltage\":\"\",\"diameter\":null,\"linked_product_id\":0,\"source_sheet\":\"Sheet1\",\"approved\":true,\"performance\":{\"flow\":[0,1,2,3,4,5],\"head\":[195,180,165,130,85,25]},\"entry_unit\":\"m3h\",\"image_url\":\"\",\"product_url\":\"\"}]}};\n        var cat=root.querySelector('.tvn-ps-category'),\n            well=root.querySelector('.tvn-ps-well'),\n            flow=root.querySelector('.tvn-ps-flow'),\n            unit=root.querySelector('.tvn-ps-flow-unit'),\n            flowHint=root.querySelector('.tvn-ps-flow-hint'),\n            head=root.querySelector('.tvn-ps-head'),\n            wellDia=root.querySelector('.tvn-ps-well-diameter'),\n            deepwellFields=root.querySelector('.tvn-ps-deepwell-fields'),\n            dynamicLevel=root.querySelector('.tvn-ps-dynamic-level'),\n            deliveryHeight=root.querySelector('.tvn-ps-delivery-height'),\n            pressure=root.querySelector('.tvn-ps-pressure'),\n            pipeLoss=root.querySelector('.tvn-ps-pipe-loss'),\n            search=root.querySelector('.tvn-ps-search'),\n            error=root.querySelector('.tvn-ps-error'),\n            area=root.querySelector('.tvn-ps-results-area'),\n            list=root.querySelector('.tvn-ps-result-list'),\n            count=root.querySelector('.tvn-ps-results-count'),\n            conv=root.querySelector('.tvn-ps-conv');\n\n        \/* Conversions: 1 m\u00b3\/h = 1000\/60 L\/min  ->  1 L\/min = 0.06 m\u00b3\/h *\/\n        function fmtLpm(m3h){\n            var x=m3h*1000\/60;\n            return x<10 ? x.toFixed(1) : x.toFixed(0);\n        }\n        function fmtM3h(lpm){\n            var x=lpm*60\/1000;\n            return String(Math.round(x*100)\/100);\n        }\n        \/* The entered value -> m\u00b3\/h (the unit used to compare against model data) *\/\n        function toM3h(v){\n            return unit.value==='lpm' ? v*60\/1000 : v;\n        }\n\n        function refreshFlowUi(){\n            var v=parseFloat(flow.value);\n            if(unit.value==='lpm'){\n                flow.placeholder='e.g. 250';\n                flowHint.textContent='Unit: liters \/ minute \u2014 click the \u25be arrow if you need m\u00b3\/hour';\n                conv.textContent=(!isNaN(v)&&v>0) ? '\u2248 '+fmtM3h(v)+' m\u00b3\/hour' : '';\n            } else {\n                flow.placeholder='e.g. 15';\n                flowHint.textContent='Unit: cubic meters \/ hour \u2014 click the \u25be arrow if you need L\/min';\n                conv.textContent=(!isNaN(v)&&v>0) ? '\u2248 '+fmtLpm(v)+' L\/min' : '';\n            }\n        }\n\n        flow.addEventListener('input',refreshFlowUi);\n        unit.addEventListener('change',refreshFlowUi);\n        refreshFlowUi();\n\n        cat.addEventListener('change',function(){\n            var isDeepwell=this.value==='deepwell';\n            well.style.display=isDeepwell?'block':'none';\n            deepwellFields.style.display=isDeepwell?'grid':'none';\n            deepwellFields.style.gridTemplateColumns='repeat(4,minmax(0,1fr))';\n            \/* Direct head input is used for other types only; deep well auto-computes TDH. *\/\n            head.closest('.tvn-ps-field').style.display=isDeepwell?'none':'';\n        });\n        \/* Run the correct state in case the calculator ever starts on Deep Well *\/\n        cat.dispatchEvent(new Event('change'));\n\n        function esc(v){\n            return String(v==null?'':v).replace(\/&\/g,'&amp;').replace(\/<\/g,'&lt;').replace(\/>\/g,'&gt;').replace(\/\"\/g,'&quot;').replace(\/'\/g,'&#039;');\n        }\n\n        \/* Small tolerance margin at the highest recorded point: if the customer\n           asks for a flow slightly above the highest point you have in the table\n           (e.g. 33.33 when you only recorded up to 33), instead of rejecting it\n           outright, we continue the slope of the curve's last segment a little\n           further (3% of the max flow). *\/\n        var TVN_PS_FLOW_TOLERANCE = 0.03;\n\n        function interpHead(curve,q){\n            var f=curve.flow||[],h=curve.head||[];\n            if(!f.length||f.length!==h.length) return null;\n            var pts=[];\n            for(var j=0;j<f.length;j++){\n                if(typeof f[j]==='number'&&typeof h[j]==='number') pts.push([f[j],h[j]]);\n            }\n            pts.sort(function(a,b){return a[0]-b[0];});\n            if(!pts.length||q<pts[0][0]) return null;\n            if(q===pts[0][0]) return pts[0][1];\n            var n=pts.length, qmax=pts[n-1][0];\n            if(q>qmax){\n                var tol=qmax*TVN_PS_FLOW_TOLERANCE;\n                if(q>qmax+tol||n<2) return null;\n                var pa=pts[n-2], pb=pts[n-1];\n                if(pb[0]===pa[0]) return null;\n                var slope=(pb[1]-pa[1])\/(pb[0]-pa[0]);\n                var est=pb[1]+slope*(q-pb[0]);\n                return est>0?est:null; \/* a downward slope can go below zero \u2014 that genuinely means it's out of range *\/\n            }\n            for(var i=0;i<n-1;i++){\n                if(q>=pts[i][0]&&q<=pts[i+1][0]){\n                    if(pts[i+1][0]===pts[i][0]) return Math.max(pts[i][1],pts[i+1][1]);\n                    var ratio=(q-pts[i][0])\/(pts[i+1][0]-pts[i][0]);\n                    return pts[i][1]+ratio*(pts[i+1][1]-pts[i][1]);\n                }\n            }\n            return null;\n        }\n\n        \/* q here is always in m\u00b3\/h *\/\n        function findMatch(catKey,q,hReq,wd){\n            var catData=TVN_DATA[catKey],c=[];\n            if(!catData||!Array.isArray(catData.products)) return c;\n            catData.products.forEach(function(p){\n                if(catKey==='deepwell'&&wd!==null&&typeof p.diameter==='number'&&p.diameter>wd) return;\n                var ah=null;\n                if(p.performance){\n                    ah=interpHead(p.performance,q);\n                    \/* Single point (Qmax\/Hmax): allowed for submersible and domestic *\/\n                    if(ah===null&&(catKey==='submersible'||catKey==='domestic')&&p.performance.flow.length===1&&p.performance.head.length===1&&q<=Number(p.performance.flow[0])){\n                        \/* A model with only one point (Qmax \/ Hmax): we assume a straight line\n                           from (0, Hmax) to (Qmax, 0). This is a conservative estimate\n                           (lower than the real curve) instead of assuming the pump delivers\n                           Hmax at any flow. *\/\n                        var qm=Number(p.performance.flow[0]), hm=Number(p.performance.head[0]);\n                        ah=hm*(1-q\/qm);\n                    }\n                } else if(p.curve){\n                    ah=interpHead(p.curve,q);\n                } else if(typeof p.max_flow==='number'&&q<=p.max_flow){\n                    ah=p.max_head;\n                }\n                if(ah!==null&&hReq>0&&ah>=hReq&&ah<=hReq*1.10){\n                    c.push({model:p.model,hp:p.hp,kw:p.kw,ampere:p.ampere,availHead:ah,diameter:p.diameter,image_url:p.image_url||'',product_url:p.product_url||'',performance:(p.performance||p.curve||null)});\n                }\n            });\n            c.sort(function(a,b){\n                var da=a.availHead-hReq,db=b.availHead-hReq;\n                if(da!==db) return da-db;\n                return (Number(a.kw)||0)-(Number(b.kw)||0);\n            });\n            return c;\n        }\n\n        \/* ================= Performance curve (Flow \/ Head) ================= *\/\n        var chartWrap=root.querySelector('.tvn-ps-chart'),\n            chartBox=root.querySelector('.tvn-ps-chart-box'),\n            svg=root.querySelector('.tvn-ps-chart-box svg'),\n            tip=root.querySelector('.tvn-ps-chart-tip'),\n            legend=root.querySelector('.tvn-ps-chart-legend'),\n            chartNote=root.querySelector('.tvn-ps-chart-note'),\n            showAllBtn=root.querySelector('.tvn-ps-showall'),\n            lastState=null, isolatedIdx=null;\n        var COLORS=['#1769d2','#e67e22','#219653','#8e44ad'];\n        var SHAPES=['circle','square','triangle','diamond'];\n        var DASHES=[null,'2 5','9 4 2 4',null]; \/* each model gets its own marker shape and dash pattern, not just a color *\/\n        var NS='http:\/\/www.w3.org\/2000\/svg';\n\n        function drawMarker(shape,cx,cy,r,color){\n            var s2=r*1.6;\n            if(shape==='square') return svgEl('rect',{x:cx-s2\/2,y:cy-s2\/2,width:s2,height:s2,fill:color,stroke:'#fff','stroke-width':2});\n            if(shape==='triangle'){\n                var p1=(cx)+','+(cy-s2*0.62), p2=(cx-s2*0.62)+','+(cy+s2*0.5), p3=(cx+s2*0.62)+','+(cy+s2*0.5);\n                return svgEl('polygon',{points:p1+' '+p2+' '+p3,fill:color,stroke:'#fff','stroke-width':2});\n            }\n            if(shape==='diamond'){\n                var d='M'+cx+','+(cy-s2*0.75)+'L'+(cx+s2*0.75)+','+cy+'L'+cx+','+(cy+s2*0.75)+'L'+(cx-s2*0.75)+','+cy+'Z';\n                return svgEl('path',{d:d,fill:color,stroke:'#fff','stroke-width':2});\n            }\n            return svgEl('circle',{cx:cx,cy:cy,r:r,fill:color,stroke:'#fff','stroke-width':2});\n        }\n\n        function svgEl(tag,attrs){\n            var e=document.createElementNS(NS,tag);\n            for(var k in attrs) e.setAttribute(k,attrs[k]);\n            return e;\n        }\n        function fmtN(v,d){ var m=Math.pow(10,d); return String(Math.round(v*m)\/m); }\n        function niceStep(range,ticks){\n            var raw=range\/ticks, mag=Math.pow(10,Math.floor(Math.log(raw)\/Math.LN10)), r=raw\/mag;\n            return (r<=1?1:(r<=2?2:(r<=5?5:10)))*mag;\n        }\n\n        \/* Smooth curve passing through every point (monotone cubic) *\/\n        function makeCurve(pts){\n            var n=pts.length, xs=[], ys=[], d=[], m=[], i;\n            for(i=0;i<n;i++){ xs.push(pts[i][0]); ys.push(pts[i][1]); }\n            for(i=0;i<n-1;i++) d[i]=(ys[i+1]-ys[i])\/(xs[i+1]-xs[i]);\n            m[0]=d[0]; m[n-1]=d[n-2];\n            for(i=1;i<n-1;i++) m[i]=(d[i-1]*d[i]<=0)?0:(d[i-1]+d[i])\/2;\n            for(i=0;i<n-1;i++){\n                if(d[i]===0){ m[i]=0; m[i+1]=0; continue; }\n                var a=m[i]\/d[i], b=m[i+1]\/d[i], s2=a*a+b*b;\n                if(s2>9){ var t=3\/Math.sqrt(s2); m[i]=t*a*d[i]; m[i+1]=t*b*d[i]; }\n            }\n            return function(x){\n                if(x<=xs[0]) return ys[0];\n                if(x>=xs[n-1]) return ys[n-1];\n                var k=0; while(x>xs[k+1]) k++;\n                var h=xs[k+1]-xs[k], t=(x-xs[k])\/h, t2=t*t, t3=t2*t;\n                return (2*t3-3*t2+1)*ys[k]+(t3-2*t2+t)*h*m[k]+(-2*t3+3*t2)*ys[k+1]+(t3-t2)*h*m[k+1];\n            };\n        }\n\n        function curveOf(m,idx){\n            var perf=m.performance||{}, f=perf.flow||[], h=perf.head||[], pts=[], i;\n            for(i=0;i<f.length;i++){ if(typeof f[i]==='number'&&typeof h[i]==='number') pts.push([f[i],h[i]]); }\n            pts.sort(function(a,b){return a[0]-b[0];});\n            var est=false;\n            if(pts.length===1){ est=true; pts=[[0,pts[0][1]],[pts[0][0],0]]; } \/* single point: estimated line from (0,Hmax) to (Qmax,0) *\/\n            if(pts.length<2||pts[pts.length-1][0]<=pts[0][0]) return null;\n            return {idx:idx,model:m.model,hp:m.hp,kw:m.kw,color:COLORS[idx%COLORS.length],shape:SHAPES[idx%SHAPES.length],dash:DASHES[idx%DASHES.length],est:est,pts:pts,\n                    f:makeCurve(pts),qmin:pts[0][0],qmax:pts[pts.length-1][0]};\n        }\n\n        function drawChart(){\n            if(!lastState||!lastState.matches.length){ chartWrap.style.display='none'; return; }\n            chartWrap.style.display='block';\n            var W=chartBox.clientWidth;\n            if(!W) return;\n            var H=W<520?300:380;\n            chartBox.style.height=H+'px';\n\n            var curves=[];\n            lastState.matches.forEach(function(m,i){ var c=curveOf(m,i); if(c) curves.push(c); });\n            if(!curves.length){ chartWrap.style.display='none'; return; }\n\n            var q=lastState.q, hReq=lastState.h, maxQ=q, maxH=hReq, anyEst=false;\n            curves.forEach(function(c){\n                if(c.qmax>maxQ) maxQ=c.qmax;\n                if(c.est) anyEst=true;\n                c.pts.forEach(function(p){ if(p[1]>maxH) maxH=p[1]; });\n            });\n            var xStep=niceStep(maxQ*1.05,6), xMax=Math.ceil(maxQ*1.05\/xStep-1e-9)*xStep;\n            var yStep=niceStep(maxH*1.05,6), yMax=Math.ceil(maxH*1.05\/yStep-1e-9)*yStep;\n\n            var pad={top:22,right:16,bottom:46,left:46};\n            var plotW=W-pad.left-pad.right, plotH=H-pad.top-pad.bottom;\n            function X(v){ return pad.left+v\/xMax*plotW; }\n            function Y(v){ return pad.top+plotH-v\/yMax*plotH; }\n\n            svg.setAttribute('viewBox','0 0 '+W+' '+H);\n            svg.innerHTML='';\n            var tickStyle='font-size:10px;fill:#68758a;font-family:inherit';\n\n            \/* Grid + H axis *\/\n            var k, v, ln, tx;\n            for(k=0;k*yStep<=yMax+1e-9;k++){\n                v=k*yStep;\n                svg.appendChild(svgEl('line',{x1:pad.left,y1:Y(v),x2:pad.left+plotW,y2:Y(v),stroke:(k===0?'#9aa7b8':'#e6ebf2'),'stroke-width':1}));\n                tx=svgEl('text',{x:pad.left-7,y:Y(v)+3.5,'text-anchor':'end',style:tickStyle}); tx.textContent=fmtN(v,2); svg.appendChild(tx);\n            }\n            for(k=0;k*xStep<=xMax+1e-9;k++){\n                v=k*xStep;\n                svg.appendChild(svgEl('line',{x1:X(v),y1:pad.top,x2:X(v),y2:pad.top+plotH,stroke:(k===0?'#9aa7b8':'#e6ebf2'),'stroke-width':1}));\n                tx=svgEl('text',{x:X(v),y:pad.top+plotH+15,'text-anchor':'middle',style:tickStyle}); tx.textContent=fmtN(v,2); svg.appendChild(tx);\n            }\n            \/* Secondary Q axis: liters \/ minute *\/\n            var lpmMax=xMax*1000\/60, lStep=niceStep(lpmMax,6);\n            for(k=0;k*lStep<=lpmMax+1e-9;k++){\n                v=k*lStep;\n                tx=svgEl('text',{x:X(v*0.06),y:pad.top+plotH+31,'text-anchor':'middle',style:tickStyle}); tx.textContent=fmtN(v,1); svg.appendChild(tx);\n                svg.appendChild(svgEl('line',{x1:X(v*0.06),y1:pad.top+plotH+18,x2:X(v*0.06),y2:pad.top+plotH+21,stroke:'#9aa7b8','stroke-width':1}));\n            }\n            tx=svgEl('text',{x:2,y:pad.top+plotH+15,style:'font-size:9px;font-weight:700;fill:#26344a;font-family:inherit'}); tx.textContent='m\u00b3\/h'; svg.appendChild(tx);\n            tx=svgEl('text',{x:2,y:pad.top+plotH+31,style:'font-size:9px;font-weight:700;fill:#26344a;font-family:inherit'}); tx.textContent='L\/min'; svg.appendChild(tx);\n            tx=svgEl('text',{x:4,y:11,style:'font-size:10px;font-weight:700;fill:#26344a;font-family:inherit'}); tx.textContent='H (m)'; svg.appendChild(tx);\n\n            \/* Curves *\/\n            var paths=[];\n            curves.forEach(function(c){\n                paths[c.idx]=null; \/* keep its slot reserved so highlight() still works consistently even if hidden *\/\n                if(isolatedIdx!==null&&c.idx!==isolatedIdx) return; \/* isolated model: every other curve is fully hidden *\/\n                var d='', N=70, i, x;\n                for(i=0;i<=N;i++){\n                    x=c.qmin+(c.qmax-c.qmin)*i\/N;\n                    d+=(i?'L':'M')+X(x).toFixed(1)+','+Y(c.f(x)).toFixed(1);\n                }\n                var path=svgEl('path',{d:d,fill:'none',stroke:c.color,'stroke-width':2.6,'stroke-linecap':'round','stroke-linejoin':'round'});\n                if(c.est) path.setAttribute('stroke-dasharray','7 5');\n                else if(c.dash) path.setAttribute('stroke-dasharray',c.dash);\n                svg.appendChild(path); paths[c.idx]=path;\n                \/* a distinctive shape marker for each model at the start of its curve (the model name is in the Legend above) *\/\n                svg.appendChild(drawMarker(c.shape,X(c.qmin),Y(c.f(c.qmin)),5.5,c.color));\n            });\n            showAllBtn.style.display=(isolatedIdx!==null)?'inline-block':'none';\n\n            \/* Requested operating point *\/\n            var px=X(q), py=Y(hReq);\n            svg.appendChild(svgEl('line',{x1:px,y1:py,x2:px,y2:pad.top+plotH,stroke:'#d93025','stroke-dasharray':'4 3',opacity:.65}));\n            svg.appendChild(svgEl('line',{x1:pad.left,y1:py,x2:px,y2:py,stroke:'#d93025','stroke-dasharray':'4 3',opacity:.65}));\n            svg.appendChild(svgEl('circle',{cx:px,cy:py,r:6,fill:'#d93025',stroke:'#fff','stroke-width':2}));\n            var rl=svgEl('text',{x:(px>W-80)?px-10:px+10,y:py-10,'text-anchor':(px>W-80)?'end':'start',style:'font-size:10px;font-weight:800;fill:#d93025;font-family:inherit'});\n            rl.textContent='Required'; svg.appendChild(rl);\n\n            \/* Hover elements *\/\n            var hoverLineX=svgEl('line',{stroke:'#8fa3bd','stroke-dasharray':'4 3',display:'none'}); \/* vertical line to the point *\/\n            var hoverLineY=svgEl('line',{stroke:'#8fa3bd','stroke-dasharray':'4 3',display:'none'}); \/* horizontal line to the H axis *\/\n            var hoverDot=null;   \/* swapped for the model's own marker shape on hover *\/\n            var hoverAxisTag=null; \/* actual head value on the axis \u2014 shown and follows the mouse *\/\n            svg.appendChild(hoverLineX);\n            svg.appendChild(hoverLineY);\n\n            function axisTag(x,y,text,color){\n                var w=Math.max(30,text.length*6.6+14), h=18;\n                var g=svgEl('g',{});\n                g.appendChild(svgEl('rect',{x:x,y:y-h\/2,width:w,height:h,rx:4,fill:color}));\n                var t=svgEl('text',{x:x+w\/2,y:y+4,'text-anchor':'middle',style:'font-size:11px;font-weight:800;fill:#fff;font-family:inherit'});\n                t.textContent=text;\n                g.appendChild(t);\n                return g;\n            }\n            var overlay=svgEl('rect',{x:pad.left,y:pad.top,width:plotW,height:plotH,fill:'transparent'});\n            svg.appendChild(overlay);\n\n            \/* Legend *\/\n            legend.innerHTML='';\n            curves.forEach(function(c){\n                var chip=document.createElement('span');\n                chip.className='tvn-ps-chip';\n                if(isolatedIdx!==null) chip.style.opacity=(c.idx===isolatedIdx)?'1':'.45';\n                var chipDash=c.est?'dashed':(c.dash?'dashed':'solid');\n                chip.innerHTML='<i class=\"'+(chipDash==='dashed'?'dash':'')+'\" style=\"border-top-color:'+c.color+'\"><\/i><svg width=\"12\" height=\"12\" style=\"flex:0 0 auto\" viewBox=\"-6 -6 12 12\">'+drawMarker(c.shape,0,0,4,c.color).outerHTML+'<\/svg>'+esc(c.model);\n                chip.addEventListener('mouseenter',function(){ if(isolatedIdx===null) highlight(c.idx); });\n                chip.addEventListener('mouseleave',function(){ if(isolatedIdx===null) highlight(null); });\n                chip.addEventListener('click',function(){ selectModel(c.idx); });\n                legend.appendChild(chip);\n            });\n            var rc=document.createElement('span'); rc.className='tvn-ps-chip'; rc.innerHTML='<i class=\"dot\"><\/i>Requested operating point'; legend.appendChild(rc);\n            chartNote.textContent=anyEst?'The dotted line = an estimated curve for models recorded with a single point only (Qmax \/ Hmax) \u2014 for a precise curve, add more Flow\/Head points for the model.':'';\n\n            function highlight(idx){\n                paths.forEach(function(pt,j){\n                    if(!pt) return;\n                    pt.setAttribute('stroke-width',(idx===j)?4:2.4);\n                    pt.setAttribute('opacity',(idx===null||idx===j)?1:.3);\n                });\n            }\n            function showTip(x,y,html){\n                tip.innerHTML=html; tip.style.display='block';\n                var tw=tip.offsetWidth, th=tip.offsetHeight;\n                var left=Math.min(Math.max(x-tw\/2,4),Math.max(W-tw-4,4));\n                var top=y-th-14; if(top<0) top=y+16;\n                tip.style.left=left+'px'; tip.style.top=top+'px';\n            }\n            function leave(){\n                tip.style.display='none';\n                hoverLineX.setAttribute('display','none');\n                hoverLineY.setAttribute('display','none');\n                if(hoverDot){ hoverDot.remove(); hoverDot=null; }\n                if(hoverAxisTag){ hoverAxisTag.remove(); hoverAxisTag=null; }\n                highlight(null);\n            }\n            function onMove(cx,cy){\n                var r=svg.getBoundingClientRect();\n                var mx=(cx-r.left)*(W\/r.width), my=(cy-r.top)*(H\/r.height);\n                if(mx<pad.left||mx>pad.left+plotW||my<pad.top||my>pad.top+plotH){ leave(); return; }\n                \/* Over the requested operating point *\/\n                if(Math.sqrt((mx-px)*(mx-px)+(my-py)*(my-py))<=14){\n                    hoverLineX.setAttribute('display','none');\n                    hoverLineY.setAttribute('display','none');\n                    if(hoverDot){ hoverDot.remove(); hoverDot=null; }\n                    if(hoverAxisTag){ hoverAxisTag.remove(); hoverAxisTag=null; }\n                    highlight(null);\n                    showTip(px,py,'<b>Requested operating point<\/b><br>Flow: <b>'+fmtN(q,2)+' m\u00b3\/hour<\/b> ('+fmtN(q*1000\/60,1)+' L\/min)<br>Head: <b>'+fmtN(hReq,1)+' m<\/b>');\n                    return;\n                }\n                var qh=(mx-pad.left)\/plotW*xMax, best=null, bd=1e9;\n                curves.forEach(function(c){\n                    if(isolatedIdx!==null&&c.idx!==isolatedIdx) return; \/* isolated model: the mouse can't hover a hidden curve *\/\n                    if(qh<c.qmin||qh>c.qmax) return;\n                    var dd=Math.abs(my-Y(c.f(qh)));\n                    if(dd<bd){ bd=dd; best=c; }\n                });\n                if(!best||bd>42){ leave(); return; }\n                var hv=best.f(qh), dx=X(qh), dy=Y(hv);\n                hoverLineX.setAttribute('x1',dx); hoverLineX.setAttribute('x2',dx); hoverLineX.setAttribute('y1',pad.top); hoverLineX.setAttribute('y2',pad.top+plotH); hoverLineX.setAttribute('display','block');\n                \/* horizontal line from the hover point to the H axis, with the actual head value following it and appearing between the grid lines (e.g. 32 between 30 and 40) *\/\n                hoverLineY.setAttribute('x1',pad.left); hoverLineY.setAttribute('x2',dx); hoverLineY.setAttribute('y1',dy); hoverLineY.setAttribute('y2',dy); hoverLineY.setAttribute('display','block');\n                if(hoverDot) hoverDot.remove();\n                hoverDot=drawMarker(best.shape,dx,dy,6,best.color);\n                svg.appendChild(hoverDot);\n                if(hoverAxisTag) hoverAxisTag.remove();\n                hoverAxisTag=axisTag(pad.left-4,dy,fmtN(hv,1),best.color);\n                svg.appendChild(hoverAxisTag);\n                highlight(best.idx);\n                var html='<span class=\"tvn-tip-dot\" style=\"background:'+best.color+'\"><\/span><b>'+esc(best.model)+'<\/b><br>'\n                    +'Head: <b>'+fmtN(hv,1)+' m<\/b><br>'\n                    +'Flow: <b>'+fmtN(qh,2)+' m\u00b3\/hour<\/b> ('+fmtN(qh*1000\/60,1)+' L\/min)';\n                if(best.hp!==null&&best.hp!==undefined&&best.hp!=='') html+='<br>Power: <b>'+esc(best.hp)+' HP<\/b>';\n                if(best.est) html+='<br><i style=\"opacity:.8\">Estimated curve (Qmax \/ Hmax)<\/i>';\n                showTip(dx,dy,html);\n            }\n            overlay.addEventListener('mousemove',function(e){ onMove(e.clientX,e.clientY); });\n            overlay.addEventListener('mouseleave',leave);\n            overlay.addEventListener('touchstart',function(e){ if(e.touches[0]) onMove(e.touches[0].clientX,e.touches[0].clientY); },{passive:true});\n            overlay.addEventListener('touchmove',function(e){ if(e.touches[0]) onMove(e.touches[0].clientX,e.touches[0].clientY); },{passive:true});\n            overlay.addEventListener('touchend',leave);\n        }\n        window.addEventListener('resize',function(){ if(lastState) drawChart(); });\n\n        function selectModel(idx){\n            isolatedIdx=(isolatedIdx===idx)?null:idx; \/* clicking the same model again shows everything again *\/\n            drawChart();\n            syncSelectedCards();\n        }\n        function syncSelectedCards(){\n            list.classList.toggle('has-selection',isolatedIdx!==null);\n            list.querySelectorAll('.tvn-ps-result-card').forEach(function(card){\n                card.classList.toggle('is-selected', isolatedIdx!==null && parseInt(card.getAttribute('data-tvn-idx'),10)===isolatedIdx);\n            });\n        }\n        list.addEventListener('click',function(e){\n            var card=e.target.closest('.tvn-ps-result-card');\n            if(!card||!list.contains(card)) return;\n            if(e.target.closest('a')) return; \/* the \"View product\" link opens normally without isolating the curve *\/\n            var idx=parseInt(card.getAttribute('data-tvn-idx'),10);\n            if(!isNaN(idx)) selectModel(idx);\n        });\n        showAllBtn.addEventListener('click',function(){ isolatedIdx=null; drawChart(); syncSelectedCards(); });\n\n        \/* q in m\u00b3\/h, qRaw = the value as typed, unitVal = 'm3h' or 'lpm' *\/\n        function render(matches,q,hReq,qRaw,unitVal){\n            \/* Only suggest pumps whose available head is enough for the requested point\n               AND is no more than 10% above the requested head.\n               Do NOT fall back to larger pumps outside this 10% window. *\/\n            var MAX_MARGIN_PCT=10, MAX_RESULTS=10, notice='';\n            if(cat.value==='deepwell'){\n                notice='<div class=\"tvn-ps-message\" style=\"display:block;margin:0 0 10px;background:#eef5ff;border:1px solid #d8e7fb;color:#46617f\">Test point: <b>'+fmtN(q,2)+' m\u00b3\/h @ '+fmtN(hReq,1)+' m TDH<\/b> \u2014 selection is made from the curve at the required flow, filtered by well diameter.<\/div>';\n            }\n\n            var tight=matches.filter(function(m){\n                if(hReq<=0) return false;\n                var margin=((m.availHead-hReq)\/hReq)*100;\n                return margin>=0 && margin<=(MAX_MARGIN_PCT + 0.000001);\n            });\n\n            \/* Strict 10% rule: if there are no models inside the allowed window,\n               show zero results instead of recommending an oversized model. *\/\n            matches=tight.slice(0,MAX_RESULTS);\n\n            if(!matches.length){\n                list.innerHTML=notice+'<div class=\"tvn-ps-message\" style=\"display:block;background:#fff8e8;border:1px solid #f0dfad;color:#8a6516\">No approved model is within 10% above the required operating point. Try a different value or contact us for help choosing.<\/div>';\n                count.textContent='Results (0)';\n                lastState=null;\n                return;\n            }\n            lastState={matches:matches,q:q,h:hReq};\n            isolatedIdx=null;\n            count.textContent='Results ('+matches.length+')';\n\n            var qMain,qSub;\n            if(unitVal==='lpm'){\n                qMain=(Math.round(qRaw*10)\/10)+' L\/min';\n                qSub=fmtM3h(qRaw)+' m\u00b3\/h';\n            } else {\n                qMain=q.toFixed(1)+' m\u00b3\/h';\n                qSub=fmtLpm(q)+' L\/min';\n            }\n\n            var html='';\n            matches.forEach(function(m,i){\n                var margin=((m.availHead-hReq)\/hReq)*100;\n                var meta=[];\n                if(m.hp!==null&&m.hp!==undefined) meta.push('<b>'+esc(m.hp)+'<\/b> HP');\n                if(m.kw!==null&&m.kw!==undefined) meta.push('<b>'+esc(m.kw)+'<\/b> kW');\n                if(m.ampere!==null&&m.ampere!==undefined) meta.push('<b>'+esc(m.ampere)+'<\/b> A');\n                if(m.diameter) meta.push('Diameter <b>'+esc(m.diameter)+'&quot;<\/b>');\n                var image=m.image_url\n                    ? '<img decoding=\"async\" loading=\"lazy\" src=\"'+esc(m.image_url)+'\" alt=\"'+esc(m.model)+'\">'\n                    : '<div class=\"tvn-ps-noimage\">Model image<br>not added<\/div>';\n                var details=m.product_url ? '<a class=\"tvn-ps-details\" href=\"'+esc(m.product_url)+'\" target=\"_blank\" rel=\"noopener noreferrer\" onclick=\"event.stopPropagation();\">View product \u2192<\/a>' : '';\n\n                html+='<article class=\"tvn-ps-result-card '+(i===0?'best':'')+'\" data-tvn-idx=\"'+i+'\">'\n                    +(i===0?'<span class=\"tvn-ps-best\">BEST MATCH<\/span>':'')\n                    +'<div class=\"tvn-ps-image\">'+image+'<\/div>'\n                    +'<div><p class=\"tvn-ps-model\">'+esc(m.model)+'<\/p><div class=\"tvn-ps-meta\">'+meta.join(' &middot; ')+'<\/div><div class=\"tvn-ps-approved\">\u2713 Approved<\/div><\/div>'\n                    +'<div class=\"tvn-ps-stat\"><small>Required flow<\/small>'\n                        +'<strong>'+esc(qMain)+'<\/strong>'\n                        +'<span class=\"tvn-ps-sub\">'+esc(qSub)+'<\/span><\/div>'\n                    +'<div class=\"tvn-ps-stat\"><small>Available head at this flow<\/small><strong>'+esc(m.availHead.toFixed(1))+' m<\/strong><div class=\"tvn-ps-margin\">+'+esc(margin.toFixed(0))+'% above required<\/div><\/div>'\n                    +'<div class=\"tvn-ps-status\"><span class=\"tvn-ps-status-icon\">\u2713<\/span><span>Suitable<\/span>'+details+'<\/div>'\n                    +'<\/article>';\n            });\n            list.innerHTML=notice+html;\n            syncSelectedCards();\n        }\n\n        search.addEventListener('click',function(){\n            var qRaw=parseFloat(flow.value),\n                hReq=parseFloat(head.value),\n                unitVal=unit.value,\n                wd=cat.value==='deepwell'?parseFloat(wellDia.value):null;\n\n            if(cat.value==='deepwell'){\n                var dl=parseFloat(dynamicLevel.value),\n                    dh=parseFloat(deliveryHeight.value),\n                    pr=parseFloat(pressure.value),\n                    pl=parseFloat(pipeLoss.value);\n                if(isNaN(qRaw)||qRaw<=0||isNaN(dl)||dl<0||isNaN(dh)||dh<0||isNaN(pr)||pr<0||isNaN(pl)||pl<0){\n                    error.textContent='For deep well pumps, please enter the flow + dynamic water level + delivery point height + pressure + pipe losses.';\n                    error.style.display='block';\n                    area.style.display='none';\n                    return;\n                }\n                \/* TDH = Dynamic Water Level + Delivery Height + Pressure Head + Pipe Loss *\/\n                hReq=dl+dh+(pr*10.197)+pl;\n            } else if(isNaN(qRaw)||isNaN(hReq)||qRaw<=0||hReq<=0){\n                error.textContent='Please enter the flow and head as numbers greater than zero.';\n                error.style.display='block';\n                area.style.display='none';\n                return;\n            }\n            var q=toM3h(qRaw); 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