{"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":"calculadora-lsi","status":"publish","type":"page","link":"https:\/\/stark-water.com\/pt\/calculadoras-para-tratamento-de-aguas\/calculadora-lsi\/","title":{"rendered":"Calculadora 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=\"calculadora lsi\" 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\">calculadora lsi<\/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=\"Calculadora LSI\">\n  <h1>Calculadora LSI<\/h1>\n  <div class=\"sub\">Calcular o \u00cdndice de Satura\u00e7\u00e3o de Langelier a partir do pH, temperatura, TDS, dureza c\u00e1lcica e alcalinidade. Liga\u00e7\u00e3o partilh\u00e1vel e exporta\u00e7\u00e3o CSV inclu\u00edda.<\/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>Temperatura (\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>Dureza c\u00e1lcica (como CaCO\u2083, mg\/L)<\/label><input id=\"ca\" value=\"150\"><\/div>\n    <div class=\"field\"><label>Alcalinidade (como CaCO\u2083, mg\/L)<\/label><input id=\"alk\" value=\"120\"><\/div>\n    <div class=\"field\"><label>Notas<\/label><input value=\"Field data; result is indicative\" disabled><\/div>\n  <\/div>\n\n  <div class=\"bar\">\n    <button class=\"btn\" id=\"lsiCalcBtn\">Calcular<\/button>\n    <button class=\"btn alt\" id=\"lsiShareBtn\">Partilhar defini\u00e7\u00f5es<\/button>\n    <button class=\"btn alt\" id=\"lsiCsvBtn\">Descarregar CSV<\/button>\n    <button class=\"btn alt\" id=\"lsiResetBtn\">Reiniciar<\/button>\n  <\/div>\n\n  <div class=\"sum\" id=\"lsiOut\">Sugest\u00e3o: As entradas devem ser expressas como CaCO\u2083 quando indicado. A temperatura deve ser &gt;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=\"Sobre esta ferramenta\">\n  <h2>O que faz esta calculadora LSI<\/h2>\n  <p>Este livre <strong>Calculadora LSI<\/strong> calcula o <em>\u00cdndice de satura\u00e7\u00e3o de Langelier<\/em> utilizando cinco entradas: <strong>pH<\/strong>, <strong>temperatura<\/strong>, <strong>TDS<\/strong> (ou condutividade convertida em TDS), <strong>dureza c\u00e1lcica<\/strong> (expresso em CaCO\u2083) e <strong>alcalinidade<\/strong> (como CaCO\u2083). O resultado ajuda-o a avaliar rapidamente se a \u00e1gua \u00e9 suscet\u00edvel de ser <strong>forma\u00e7\u00e3o de escamas<\/strong>, <strong>equilibrado<\/strong> ou <strong>corrosivo<\/strong>para que possa definir objectivos pr\u00e1ticos para o pr\u00e9-tratamento, dosagem de anti-incrustante ou estabiliza\u00e7\u00e3o p\u00f3s-tratamento.<\/p>\n\n  <h2>Quando o utilizar<\/h2>\n  <ul>\n    <li><strong>Crivagem de \u00e1gua de alimenta\u00e7\u00e3o RO<\/strong> - estimar a tend\u00eancia de escala antes da conce\u00e7\u00e3o da membrana e da sele\u00e7\u00e3o do anti-incrustante.<\/li>\n    <li><strong>\u00c1gua de arrefecimento<\/strong> - verificar se os ciclos de concentra\u00e7\u00e3o levam a LSI a entrar em territ\u00f3rio de grande escala.<\/li>\n    <li><strong>Estabiliza\u00e7\u00e3o de processos e de \u00e1gua pot\u00e1vel<\/strong> - verificar se a \u00e1gua acabada ap\u00f3s a RO necessita de remineraliza\u00e7\u00e3o da alcalinidade.<\/li>\n  <\/ul>\n\n  <h2>Explica\u00e7\u00e3o das entradas<\/h2>\n  <ul>\n    <li><strong>pH<\/strong> - valor medido no terreno ou em linha \u00e0 temperatura de funcionamento.<\/li>\n    <li><strong>Temperatura<\/strong> - \u00b0C; o LSI \u00e9 sens\u00edvel \u00e0 temperatura (uma \u00e1gua mais quente aumenta normalmente o risco de descama\u00e7\u00e3o).<\/li>\n    <li><strong>TDS<\/strong> - mg\/L. Se s\u00f3 tiver a condutividade, aplique o seu fator de local (por exemplo, TDS \u2248 0,5-0,7 \u00d7 \u03bcS\/cm) e verifique com os dados de laborat\u00f3rio.<\/li>\n    <li><strong>Dureza c\u00e1lcica<\/strong> - como CaCO\u2083 (mg\/L); n\u00e3o utilizar a dureza total se o Mg for significativo.<\/li>\n    <li><strong>Alcalinidade<\/strong> - como CaCO\u2083 (mg\/L); principalmente alcalinidade de bicarbonato\/carbonato.<\/li>\n  <\/ul>\n\n  <h2>Como \u00e9 calculado o LSI (conceito)<\/h2>\n  <p>A LSI \u00e9 definida como <strong>LSI = pH - pH<sub>s<\/sub><\/strong>, em que <em>pH<sub>s<\/sub><\/em> \u00e9 o pH de satura\u00e7\u00e3o no qual a \u00e1gua est\u00e1 em equil\u00edbrio com o carbonato de c\u00e1lcio. Uma forma de engenharia comum \u00e9:<\/p>\n  <p><em>pH<sub>s<\/sub> = (9,3 + A + B) - (C + D)<\/em>em que os termos A-D s\u00e3o fun\u00e7\u00f5es de TDS, temperatura, dureza c\u00e1lcica e alcalinidade.<br>\n  Os diferentes manuais utilizam constantes ligeiramente diferentes, mas a interpreta\u00e7\u00e3o que se segue mant\u00e9m-se consistente.<\/p>\n\n  <h2>Como interpretar o LSI<\/h2>\n  <ul>\n    <li><strong>LSI &gt; +0,5<\/strong> - fortemente escalonado: esperar a precipita\u00e7\u00e3o de CaCO\u2083 sem controlo.<\/li>\n    <li><strong>+0.2 ... +0.5<\/strong> - tend\u00eancia ligeiramente descamativa \/ protetora.<\/li>\n    <li><strong>-0.2 ... +0.2<\/strong> - quase equilibrado; ajuste fino com dados em tempo real.<\/li>\n    <li><strong>-0.5 ... -0.2<\/strong> - ligeiramente corrosivo; verificar a alcalinidade e a capacidade de tamponamento.<\/li>\n    <li><strong>&lt; -0.5<\/strong> - tend\u00eancia corrosiva; considerar a estabiliza\u00e7\u00e3o (por exemplo, c\u00e1ustica, remineraliza\u00e7\u00e3o) e a sele\u00e7\u00e3o de materiais.<\/li>\n  <\/ul>\n\n  <h2>Exemplo de trabalho (ilustrativo)<\/h2>\n  <p>A 25 \u00b0C com pH = 7,6, TDS = 1.000 mg\/L, dureza Ca = 120 mg\/L como CaCO\u2083, alcalinidade = 80 mg\/L como CaCO\u2083, a calculadora d\u00e1 <strong>LSI \u2248 -0,3<\/strong> (ligeiramente corrosivo). As op\u00e7\u00f5es incluem o aumento da alcalinidade, o aumento ligeiro do ponto de regula\u00e7\u00e3o do pH ou a mistura com um fluxo mais mineralizado para avan\u00e7ar para LSI \u2248 0.<\/p>\n\n  <h2>Boas pr\u00e1ticas e advert\u00eancias<\/h2>\n  <ul>\n    <li><strong>Corre\u00e7\u00e3o da temperatura<\/strong> as suas entradas; a mistura de amostras quentes e frias distorce os resultados.<\/li>\n    <li>Em <strong>TDS muito baixo<\/strong> (&lt;~100 mg\/L) ou <strong>TDS muito elevado<\/strong> (&gt;~10.000 mg\/L), o LSI torna-se menos preditivo. Nesses regimes, consultar \u00edndices adicionais (por exemplo, RSI, CCPP) e dados piloto.<\/li>\n    <li>O permeado de OR tem frequentemente <strong>alcalinidade muito baixa<\/strong> e mau tamponamento; as pequenas altera\u00e7\u00f5es de pH alteram muito o LSI - verificar o pH em linha e adicionar estabiliza\u00e7\u00e3o, se necess\u00e1rio.<\/li>\n    <li>Utilizar LSI com <strong>tabelas de conce\u00e7\u00e3o de anti-incrustantes<\/strong> e real <strong>limites da membrana<\/strong>O LSI \u00e9 um indicador, n\u00e3o uma garantia.<\/li>\n  <\/ul>\n\n  <h2>Leitura relacionada<\/h2>\n  <p>Os antecedentes do \u00edndice est\u00e3o resumidos aqui: <a href=\"https:\/\/en.wikipedia.org\/wiki\/Langelier_saturation_index\" target=\"_blank\" rel=\"nofollow noopener\">\u00cdndice de Satura\u00e7\u00e3o de Langelier (Wikipedia)<\/a>. Para pr\u00e9-tratamento de RO e modela\u00e7\u00e3o de custos, experimente o nosso <a href=\"\/pt\/stark-water-tools\/stark-water-tools-ro-opex-calculator\/\">Calculadora RO OPEX<\/a> e o <a href=\"\/pt\/solucao\/1000lph-ro-solution\/\">Solu\u00e7\u00e3o de tratamento de \u00e1gua RO 1000 LPH<\/a>.<\/p>\n\n  <h2>Da calculadora \u00e0 a\u00e7\u00e3o<\/h2>\n  <p>Se o LSI mostrar risco de incrusta\u00e7\u00e3o \u00e0 sua temperatura de funcionamento, as op\u00e7\u00f5es incluem uma recupera\u00e7\u00e3o mais baixa, dosagem de anti-incrustante, ajuste do ponto de regula\u00e7\u00e3o do pH ou amaciamento a montante. Se o LSI mostrar tend\u00eancia corrosiva na \u00e1gua acabada, considere a remineraliza\u00e7\u00e3o (alcalinidade, dureza) e a compatibilidade de materiais na tubagem a jusante.<\/p>\n<\/section>\n\n\n\n<svg width=\"880\" height=\"140\" viewbox=\"0 0 880 140\" role=\"img\" aria-label=\"Zonas de interpreta\u00e7\u00e3o LSI\" 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\">Tend\u00eancia corrosiva (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\">Equilibrado (~ -0,2 a +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\">Tend\u00eancia de escala (LSI &gt; 0)<\/text>\n  <text x=\"20\" y=\"30\" class=\"t\">Interpreta\u00e7\u00e3o relativa ao pH<sub>s<\/sub> (LSI = pH - pH<sub>s<\/sub>)<\/text>\n<\/svg>\n\n\n\n<section aria-label=\"FAQ\">\n  <h2>FAQ<\/h2>\n\n  <details><summary>De que dados necessito para a calculadora LSI?<\/summary>\n    <p>pH, temperatura (\u00b0C), TDS (mg\/L), dureza c\u00e1lcica em CaCO\u2083 (mg\/L) e alcalinidade em CaCO\u2083 (mg\/L). Utilizar valores corrigidos pela temperatura da mesma amostra.<\/p>\n  <\/details>\n\n  <details><summary>Como \u00e9 que interpreto o resultado do LSI?<\/summary>\n    <p>LSI &gt; +0,5 indica uma tend\u00eancia de incrusta\u00e7\u00e3o; -0,5 a -0,2 indica uma tend\u00eancia corrosiva; -0,2 a +0,2 est\u00e1 pr\u00f3ximo do equil\u00edbrio. Utilizar dados de tend\u00eancias e testes no local para confirmar.<\/p>\n  <\/details>\n\n  <details><summary>O LSI \u00e9 fi\u00e1vel para o permeado RO?<\/summary>\n    <p>\u00c9 indicativo, mas menos est\u00e1vel, porque o permeado tem uma baixa alcalinidade e um fraco efeito tamp\u00e3o. Pequenos desvios de pH podem alterar o LSI. Estabilizar o permeado, se necess\u00e1rio.<\/p>\n  <\/details>\n\n  <details><summary>O que devo fazer se o LSI for fortemente positivo?<\/summary>\n    <p>Reduzir o risco de incrusta\u00e7\u00e3o atrav\u00e9s de anti-incrustante, menor recupera\u00e7\u00e3o, controlo do pH ou amaciamento. Confirmar com os limites do fornecedor e dados piloto.<\/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). Use temperature-corrected values from the same sample.\"}},\n    {\"@type\":\"Question\",\"name\":\"How do I interpret the LSI result?\",\n     \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"LSI > +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.\"}},\n    {\"@type\":\"Question\",\"name\":\"Is LSI reliable for RO permeate?\",\n     \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"It\u2019s indicative but less stable because permeate has low alkalinity and poor buffering. Small pH drifts can swing LSI. Stabilize permeate if needed.\"}},\n    {\"@type\":\"Question\",\"name\":\"What should I do if LSI is strongly positive?\",\n     \"acceptedAnswer\":{\"@type\":\"Answer\",\"text\":\"Reduce scaling risk via antiscalant, lower recovery, pH control or softening. Confirm with vendor limits and pilot data.\"}}\n  ]\n}\n<\/script>","protected":false},"excerpt":{"rendered":"<p>LSI Calculator Compute Langelier Saturation Index from pH, temperature, TDS, calcium hardness and alkalinity. Shareable link &#038; CSV export included. 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