{"id":19086,"date":"2025-08-20T15:17:25","date_gmt":"2025-08-20T07:17:25","guid":{"rendered":"https:\/\/stark-water.com\/?page_id=19086"},"modified":"2025-08-20T16:54:28","modified_gmt":"2025-08-20T08:54:28","slug":"lsi-calculator","status":"publish","type":"page","link":"https:\/\/stark-water.com\/pl\/water-treatment-calculators\/lsi-calculator\/","title":{"rendered":"Kalkulator LSI"},"content":{"rendered":"<figure class=\"wp-block-image aligncenter size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"683\" src=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/08\/lsi-calculator-1024x683.png\" alt=\"lsi calculator\" class=\"wp-image-19173\" title=\"\" srcset=\"https:\/\/stark-water.com\/wp-content\/uploads\/2025\/08\/lsi-calculator-1024x683.png 1024w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/08\/lsi-calculator-300x200.png 300w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/08\/lsi-calculator-768x512.png 768w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/08\/lsi-calculator-18x12.png 18w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/08\/lsi-calculator-600x400.png 600w, https:\/\/stark-water.com\/wp-content\/uploads\/2025\/08\/lsi-calculator.png 1536w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><figcaption class=\"wp-element-caption\">lsi calculator<\/figcaption><\/figure>\n\n\n\n<style>\n#lsicalc{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Arial,sans-serif;max-width:900px;margin:0 auto;border:1px solid #e5e7eb;border-radius:14px;padding:16px;background:#fff}\n#lsicalc h1{font-size:24px;margin:0 0 6px}\n#lsicalc .sub{color:#64748b;font-size:14px;margin-bottom:10px}\n#lsicalc .grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}\n#lsicalc .field{display:flex;flex-direction:column;font-size:14px}\n#lsicalc .field input{padding:8px;border:1px solid #cbd5e1;border-radius:10px}\n#lsicalc .bar{display:flex;gap:10px;flex-wrap:wrap;margin-top:10px}\n#lsicalc .btn{padding:8px 12px;border:1px solid #0f172a;border-radius:10px;background:#0f172a;color:#fff;cursor:pointer}\n#lsicalc .btn.alt{background:#fff;color:#0f172a}\n#lsicalc .sum{background:#fafafa;border:1px solid #eee;border-radius:10px;padding:12px;margin-top:12px;font-size:14px}\n#lsicalc .ok{color:#059669} .warn{color:#b45309} .bad{color:#b91c1c}\n@media(max-width:1000px){#lsicalc .grid{grid-template-columns:repeat(2,minmax(0,1fr))}}\n@media(max-width:560px){#lsicalc .grid{grid-template-columns:1fr}}\n<\/style>\n\n<div id=\"lsicalc\" aria-label=\"Kalkulator LSI\">\n  <h1>Kalkulator LSI<\/h1>\n  <div class=\"sub\">Compute Langelier Saturation Index from pH, temperature, TDS, calcium hardness and alkalinity. Shareable link &#038; CSV export included.<\/div>\n\n  <div class=\"grid\">\n    <div class=\"field\"><label>pH<\/label><input id=\"ph\" value=\"7.5\"><\/div>\n    <div class=\"field\"><label>Temperature (\u00b0C)<\/label><input id=\"temp\" value=\"25\"><\/div>\n    <div class=\"field\"><label>TDS (ppm)<\/label><input id=\"tds\" value=\"500\"><\/div>\n    <div class=\"field\"><label>Calcium hardness (as CaCO\u2083, mg\/L)<\/label><input id=\"ca\" value=\"150\"><\/div>\n    <div class=\"field\"><label>Alkalinity (as CaCO\u2083, mg\/L)<\/label><input id=\"alk\" value=\"120\"><\/div>\n    <div class=\"field\"><label>Uwagi<\/label><input value=\"Field data; result is indicative\" disabled><\/div>\n  <\/div>\n\n  <div class=\"bar\">\n    <button class=\"btn\" id=\"lsiCalcBtn\">Oblicza\u0107<\/button>\n    <button class=\"btn alt\" id=\"lsiShareBtn\">Ustawienia udost\u0119pniania<\/button>\n    <button class=\"btn alt\" id=\"lsiCsvBtn\">Pobierz CSV<\/button>\n    <button class=\"btn alt\" id=\"lsiResetBtn\">Reset<\/button>\n  <\/div>\n\n  <div class=\"sum\" id=\"lsiOut\">Tip: Inputs should be expressed as CaCO\u2083 where noted. Temperature must be >0\u00b0C.<\/div>\n<\/div>\n\n<script>\n(function(){\n  const box=document.getElementById('lsicalc'); const $=s=>box.querySelector(s);\n  function num(v){return parseFloat(String(v).replace(\/[^0-9.,-]\/g,'').replace(',', '.'))||0}\n  function clamp(x,lo,hi){return Math.max(lo, Math.min(hi,x));}\n  function compute(){\n    const pH = num($('#ph').value);\n    const T  = Math.max(0.1, num($('#temp').value)); \/\/ guard\n    const TDS = Math.max(1, num($('#tds').value));\n    const Ca  = Math.max(1, num($('#ca').value));\n    const Alk = Math.max(1, num($('#alk').value));\n\n    \/\/ LSI components (industry standard approximation)\n    const A = (Math.log10(TDS) - 1) \/ 10;\n    const B = -13.12 * Math.log10(T + 273) + 34.55;\n    const C = Math.log10(Ca) - 0.4;\n    const D = Math.log10(Alk);\n\n    const pHs = (9.3 + A + B) - (C + D);\n    const LSI = pH - pHs;\n\n    let verdict, cls='ok';\n    if(LSI > 0.5){ verdict='Scaling likely (calcite supersaturation)'; cls='warn'; }\n    else if(LSI > 0){ verdict='Slight scaling tendency'; cls='ok'; }\n    else if(LSI > -0.5){ verdict='Slightly corrosive tendency'; cls='warn'; }\n    else { verdict='Corrosive (undersaturated)'; cls='bad'; }\n\n    return {pH,T,TDS,Ca,Alk,A,B,C,D,pHs,LSI,verdict,cls};\n  }\n\n  function render(){\n    const r = compute();\n    $('#lsiOut').innerHTML = `\n      <b>LSI = ${r.LSI.toFixed(2)}<\/b> \u2014 <span class=\"${r.cls}\">${r.verdict}<\/span><br>\n      <b>pHs<\/b> (saturation pH) = ${r.pHs.toFixed(2)}<br>\n      <small>A=${r.A.toFixed(3)}, B=${r.B.toFixed(3)}, C=${r.C.toFixed(3)}, D=${r.D.toFixed(3)}<\/small><br>\n      <small>Note: LSI is an empirical indicator. Confirm with recovery, temperature correction and antiscalant design before final decisions.<\/small>\n    `;\n    document.dispatchEvent(new CustomEvent('ro_lsi_calculated',{detail:r}));\n    return r;\n  }\n\n  function share(){\n    const ids=['ph','temp','tds','ca','alk'];\n    const p=new URLSearchParams(); ids.forEach(id=>p.set(id, document.getElementById(id).value));\n    const url=location.origin+location.pathname+'?'+p.toString();\n    if(navigator.clipboard) navigator.clipboard.writeText(url).catch(()=>{});\n    alert('Sharable link copied:\\\\n'+url);\n    document.dispatchEvent(new CustomEvent('ro_lsi_shared',{detail:{url}}));\n  }\n\n  function toCSV(r){\n    const rows = [\n      ['pH', r.pH],\n      ['Temperature (C)', r.T],\n      ['TDS (ppm)', r.TDS],\n      ['Calcium hardness (as CaCO3, mg\/L)', r.Ca],\n      ['Alkalinity (as CaCO3, mg\/L)', r.Alk],\n      ['A', r.A], ['B', r.B], ['C', r.C], ['D', r.D],\n      ['pHs', r.pHs],\n      ['LSI', r.LSI],\n      ['Verdict', r.verdict]\n    ];\n    return rows.map(r=>r.join(',')).join('\\\\n');\n  }\n  function download(name, text){\n    const a=document.createElement('a');\n    a.href='data:text\/csv;charset=utf-8,'+encodeURIComponent(text);\n    a.download=name; a.click();\n  }\n\n  \/\/ Events\n  $('#lsiCalcBtn').addEventListener('click', ()=>{ const r=render(); });\n  $('#lsiShareBtn').addEventListener('click', share);\n  $('#lsiCsvBtn').addEventListener('click', ()=>{ const r=render(); download('lsi-'+Date.now()+'.csv', toCSV(r)); });\n  $('#lsiResetBtn').addEventListener('click', ()=>{\n    $('#ph').value='7.5'; $('#temp').value='25'; $('#tds').value='500'; $('#ca').value='150'; $('#alk').value='120';\n    render();\n  });\n\n  \/\/ Restore from URL if present\n  const q=new URLSearchParams(location.search);\n  q.forEach((v,k)=>{ const el=document.getElementById(k); if(el) el.value=v; });\n\n  render(); \/\/ initial\n})();\n<\/script>\n\n\n\n<section aria-label=\"About this tool\">\n  <h2>What this LSI calculator does<\/h2>\n  <p>This free <strong>Kalkulator LSI<\/strong> computes the <em>Langelier Saturation Index<\/em> using five inputs: <strong>pH<\/strong>, <strong>temperature<\/strong>, <strong>TDS<\/strong> (or conductivity converted to TDS), <strong>calcium hardness<\/strong> (as CaCO\u2083) and <strong>alkalinity<\/strong> (as CaCO\u2083). The result helps you quickly judge whether water is likely to be <strong>scale forming<\/strong>, <strong>balanced<\/strong> lub <strong>corrosive<\/strong>, so you can set practical targets for pretreatment, antiscalant dosing, or post-treatment stabilization.<\/p>\n\n  <h2>When to use it<\/h2>\n  <ul>\n    <li><strong>RO feedwater screening<\/strong> \u2014 estimate scale tendency before membrane design and antiscalant selection.<\/li>\n    <li><strong>Cooling water<\/strong> \u2014 monitor whether cycles of concentration push LSI into heavy scaling territory.<\/li>\n    <li><strong>Process &#038; potable stabilization<\/strong> \u2014 check if finished water after RO needs alkalinity remineralization.<\/li>\n  <\/ul>\n\n  <h2>Inputs explained<\/h2>\n  <ul>\n    <li><strong>pH<\/strong> \u2014 field-measured or online value at operating temperature.<\/li>\n    <li><strong>Temperatura<\/strong> \u2014 \u00b0C; LSI is temperature sensitive (warmer water usually raises scaling risk).<\/li>\n    <li><strong>TDS<\/strong> \u2014 mg\/L. If you only have conductivity, apply your site factor (e.g., TDS \u2248 0.5\u20130.7 \u00d7 \u03bcS\/cm) and verify with lab data.<\/li>\n    <li><strong>Calcium hardness<\/strong> \u2014 as CaCO\u2083 (mg\/L); do not use total hardness if Mg is significant.<\/li>\n    <li><strong>Alkalinity<\/strong> \u2014 as CaCO\u2083 (mg\/L); primarily bicarbonate\/carbonate alkalinity.<\/li>\n  <\/ul>\n\n  <h2>How LSI is calculated (concept)<\/h2>\n  <p>LSI is defined as <strong>LSI = pH \u2212 pH<sub>s<\/sub><\/strong>, where <em>pH<sub>s<\/sub><\/em> is the saturation pH at which water is in equilibrium with calcium carbonate. A common engineering form is:<\/p>\n  <p><em>pH<sub>s<\/sub> = (9.3 + A + B) \u2212 (C + D)<\/em>, where terms A\u2013D are functions of TDS, temperature, calcium hardness and alkalinity.<br>\n  Different handbooks use slightly different constants, but the interpretation below remains consistent.<\/p>\n\n  <h2>How to interpret LSI<\/h2>\n  <ul>\n    <li><strong>LSI &gt; +0.5<\/strong> \u2014 strongly scaling: expect CaCO\u2083 precipitation without control.<\/li>\n    <li><strong>+0.2 \u2026 +0.5<\/strong> \u2014 mildly scaling \/ protective tendency.<\/li>\n    <li><strong>\u22120.2 \u2026 +0.2<\/strong> \u2014 near balanced; fine-tune with real-time data.<\/li>\n    <li><strong>\u22120.5 \u2026 \u22120.2<\/strong> \u2014 mildly corrosive; check alkalinity and buffering.<\/li>\n    <li><strong>&lt; \u22120.5<\/strong> \u2014 corrosive tendency; consider stabilization (e.g., caustic, remineralization) and materials selection.<\/li>\n  <\/ul>\n\n  <h2>Worked example (illustrative)<\/h2>\n  <p>At 25 \u00b0C with pH = 7.6, TDS = 1,000 mg\/L, Ca hardness = 120 mg\/L as CaCO\u2083, alkalinity = 80 mg\/L as CaCO\u2083, the calculator gives <strong>LSI \u2248 \u22120.3<\/strong> (slightly corrosive). Options include raising alkalinity, slightly increasing pH set-point, or blending with a more mineralized stream to move toward LSI \u2248 0.<\/p>\n\n  <h2>Good practice &#038; caveats<\/h2>\n  <ul>\n    <li><strong>Temperature-correct<\/strong> your inputs; mixing hot and cold samples skews results.<\/li>\n    <li>Przy <strong>very low TDS<\/strong> (&lt;~100 mg\/L) or <strong>very high TDS<\/strong> (&gt;~10,000 mg\/L), LSI becomes less predictive. In those regimes, consult additional indices (e.g., RSI, CCPP) and pilot data.<\/li>\n    <li>RO permeate often has <strong>very low alkalinity<\/strong> and poor buffering; tiny pH changes move LSI a lot \u2014 trend online pH and add stabilization if needed.<\/li>\n    <li>Use LSI with <strong>antiscalant design tables<\/strong> and actual <strong>membrane limits<\/strong>; LSI is an indicator, not a guarantee.<\/li>\n  <\/ul>\n\n  <h2>Related reading<\/h2>\n  <p>Background on the index is summarized here: <a href=\"https:\/\/en.wikipedia.org\/wiki\/Langelier_saturation_index\" target=\"_blank\" rel=\"nofollow noopener\">Langelier Saturation Index (Wikipedia)<\/a>. For RO pretreatment and cost modeling, try our <a href=\"\/pl\/stark-water-tools\/stark-water-tools-ro-opex-calculator\/\">RO OPEX Calculator<\/a> i <a href=\"\/pl\/rozwiazanie\/1000lph-ro-solution\/\">Rozwi\u0105zanie do uzdatniania wody RO 1000 LPH<\/a>.<\/p>\n\n  <h2>From calculator to action<\/h2>\n  <p>If LSI shows scaling risk at your operating temperature, options include lower recovery, antiscalant dosing, pH set-point adjustment or upstream softening. If LSI shows corrosive tendency in finished water, consider remineralization (alkalinity, hardness) and materials compatibility in downstream piping.<\/p>\n<\/section>\n\n\n\n<svg width=\"880\" height=\"140\" viewbox=\"0 0 880 140\" role=\"img\" aria-label=\"LSI interpretation zones\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\">\n  <style>.t{font:12px system-ui}.z{font:12px system-ui;fill:#334155}<\/style>\n  <rect x=\"20\" y=\"50\" width=\"260\" height=\"40\" fill=\"#fee2e2\"\/><text x=\"150\" y=\"75\" text-anchor=\"middle\" class=\"z\">Corrosive tendency (LSI < 0)<\/text>\n  <rect x=\"280\" y=\"50\" width=\"320\" height=\"40\" fill=\"#e2e8f0\"\/><text x=\"440\" y=\"75\" text-anchor=\"middle\" class=\"z\">Balanced (~ \u22120.2 to +0.2)<\/text>\n  <rect x=\"600\" y=\"50\" width=\"260\" height=\"40\" fill=\"#dcfce7\"\/><text x=\"730\" y=\"75\" text-anchor=\"middle\" class=\"z\">Scaling tendency (LSI > 0)<\/text>\n  <text x=\"20\" y=\"30\" class=\"t\">Interpretation relative to pH<sub>s<\/sub> (LSI = pH \u2212 pH<sub>s<\/sub>)<\/text>\n<\/svg>\n\n\n\n<section aria-label=\"FAQ\">\n  <h2>FAQ<\/h2>\n\n  <details><summary>What inputs do I need for the LSI calculator?<\/summary>\n    <p>pH, temperature (\u00b0C), TDS (mg\/L), calcium hardness as CaCO\u2083 (mg\/L) and alkalinity as CaCO\u2083 (mg\/L). Use temperature-corrected values from the same sample.<\/p>\n  <\/details>\n\n  <details><summary>How do I interpret the LSI result?<\/summary>\n    <p>LSI &gt; +0.5 indicates scaling tendency; \u22120.5 to \u22120.2 indicates corrosive tendency; \u22120.2 to +0.2 is close to balanced. Use trend data and onsite testing to confirm.<\/p>\n  <\/details>\n\n  <details><summary>Is LSI reliable for RO permeate?<\/summary>\n    <p>It\u2019s indicative but less stable because permeate has low alkalinity and poor buffering. Small pH drifts can swing LSI. Stabilize permeate if needed.<\/p>\n  <\/details>\n\n  <details><summary>What should I do if LSI is strongly positive?<\/summary>\n    <p>Reduce scaling risk via antiscalant, lower recovery, pH control or softening. Confirm with vendor limits and pilot data.<\/p>\n  <\/details>\n<\/section>\n\n\n\n<script type=\"application\/ld+json\">\n{\n \"@context\":\"https:\/\/schema.org\",\n \"@type\":\"SoftwareApplication\",\n \"name\":\"LSI Calculator\",\n \"applicationCategory\":\"BusinessApplication\",\n \"operatingSystem\":\"Web\",\n \"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"USD\"},\n \"url\":\"https:\/\/stark-water.com\/stark-water-tools\/lsi-calculator\/\",\n \"description\":\"Compute LSI from pH, temperature, TDS, calcium hardness and alkalinity to indicate scaling or corrosion tendency.\"\n}\n<\/script>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"SoftwareApplication\",\n  \"name\":\"LSI Calculator\",\n  \"applicationCategory\":\"EngineeringApplication\",\n  \"operatingSystem\":\"Web\",\n  \"isAccessibleForFree\": true,\n  \"offers\":{\"@type\":\"Offer\",\"price\":\"0\",\"priceCurrency\":\"USD\"},\n  \"url\":\"https:\/\/stark-water.com\/stark-water-tools\/lsi-calculator\/\",\n  \"description\":\"Compute Langelier Saturation Index (LSI) from pH, temperature, TDS, calcium hardness and alkalinity; interpret scale or corrosion tendency with examples and caveats.\",\n  \"keywords\":[\"lsi calculator\",\"langelier saturation index\",\"scale index\",\"water stability index\"],\n  \"publisher\":{\"@type\":\"Organization\",\"name\":\"Stark Water\",\"url\":\"https:\/\/stark-water.com\"},\n  \"potentialAction\":{\"@type\":\"UseAction\",\"target\":\"https:\/\/stark-water.com\/stark-water-tools\/lsi-calculator\/\"}\n}\n<\/script>\n\n\n\n<script type=\"application\/ld+json\">\n{\n  \"@context\":\"https:\/\/schema.org\",\n  \"@type\":\"FAQPage\",\n  \"mainEntity\":[\n    {\"@type\":\"Question\",\"name\":\"What inputs do I need for the LSI calculator?\",\n     \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"pH, temperature (\u00b0C), TDS (mg\/L), calcium hardness as CaCO3 (mg\/L) and alkalinity as CaCO3 (mg\/L). 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