Pre-filter / hair strainer — Pool equipment (Filtration & Circulation). Framework: Plant technology / Energy efficiency.tent="The hair strainer acts as the primary mechanical barrier in the pre-filtration zone of a swimming pool system to remove large debris and hair from the circuit."> <link rel="canonical" href="https://stromfee-mauritius.ai/en/glaesern/piscine/wizards/vorfilter/"> <script type="application/ld+json">{"@context": "https://schema.org", "@type": "Article", "headline": "Why is monitoring the hair strainer in the swimming pool important?", "mainEntityOfPage": "https://stromfee-mauritius.ai/glaesern/piscine/wizards/vorfilter/", "description": "Pre-filter / hair strainer — Pool equipment (Filtration & Circulation). Framework: Plant technology / Energy efficiency."}</script> <script type="application/ld+json">{"@context": "https://schema.org", "@type": "FAQPage", "mainEntity": [{"@type": "Question", "name": "What is the function of a hair strainer in a swimming pool?", "acceptedAnswer": {"@type": "Answer", "text": "The hair strainer filters out coarse particles and hair from the water flow before they reach the main filtration system or the circulation pumps."}}, {"@type": "Question", "name": "Why must the hair strainer be cleaned regularly?", "acceptedAnswer": {"@type": "Answer", "text": "Obstructed strainers increase back-pressure in the system, leading to pump overloading and a decrease in flow volume."}}, {"@type": "Question", "name": "How to recognize an obstruction in the pre-filter?", "acceptedAnswer": {"@type": "Answer", "text": "An increase in differential pressure between the inlet and outlet zones of the filter is the technical indicator of contamination."}}, {"@type": "Question", "name": "At what point should the hair strainer be maintained?", "acceptedAnswer": {"@type": "Answer", "text": "Maintenance is required as soon as the differential pressure exceeds a defined limit value or when visual inspection shows an accumulation of materials."}}, {"@type": "Question", "name": "What is the impact of the hair strainer on energy efficiency?", "acceptedAnswer": {"@type": "Answer", "text": "A clear hair strainer minimizes resistance in the system, allowing the circulation pump to move the required volume with lower energy consumption."}}, {"@type": "Question", "name": "Why is remote monitoring of the pre-filter useful?", "acceptedAnswer": {"@type": "Answer", "text": "It allows for maintenance tailored to needs and prevents emergencies caused by pump overheating due to blockages in the pre-filter."}}]}</script> <style>:root{--bg:#fdfcff;--bg-soft:#faf8ff;--surface:#fff;--text:#1d1d1f;--text-2:#515154;--text-3:#86868b;--border:#fed7aa;--border-soft:#efeaf8;--accent:#f97316;--accent-bright:#fdba74;--accent-dim:rgba(234,88,12,.08);--emerald:#ea580c;--font:'Inter',-apple-system,sans-serif;--mono:'JetBrains Mono',monospace;--radius:16px}*{box-sizing:border-box;margin:0;padding:0} body{background:var(--bg);color:var(--text);font-family:var(--font);line-height:1.6; -webkit-font-smoothing:antialiased} .wrap{max-width:1080px;margin:0 auto;padding:0 24px} header{padding:14px 0;border-bottom:1px solid var(--border-soft);background:rgba(255,255,255,.72); backdrop-filter:saturate(180%) blur(20px);position:sticky;top:0;z-index:9} header a{color:var(--text-2);text-decoration:none;font-size:13px;margin-right:18px} header a:hover{color:var(--accent)} .hero{padding:56px 0 32px} .eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.12em;text-transform:uppercase; color:var(--accent);margin-bottom:10px} h1{font-size:40px;letter-spacing:-.022em;line-height:1.12;margin-bottom:12px} .lead{font-size:19px;color:var(--text-2);max-width:62ch} h2{font-size:23px;letter-spacing:-.015em;margin:44px 0 6px} .sub{color:var(--text-3);font-size:14px;margin-bottom:18px} .steps{display:grid;grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px;margin:22px 0 8px} .step{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:16px 18px} .step b{display:block;font-size:15px;margin-bottom:4px} .step span{font-size:13px;color:var(--text-3)} .step i{font-family:var(--mono);font-size:11px;color:var(--accent);font-style:normal} .cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px} .c{display:block;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius); padding:16px 18px;text-decoration:none;color:inherit;transition:.16s} .c:hover{border-color:var(--accent-bright);box-shadow:0 8px 26px rgba(234,88,12,.16);transform:translateY(-2px)} .c b{display:block;font-size:15px;letter-spacing:-.01em} .c span{font-size:12.5px;color:var(--text-3);font-family:var(--mono)} .tag{display:inline-block;font-family:var(--mono);font-size:10.5px;padding:2px 7px;border-radius:6px; background:var(--accent-dim);color:var(--accent);margin-top:8px} .tag.de{background:rgba(180,83,9,.09);color:#b45309} .tag.live{background:rgba(234,88,12,.10);color:#ea580c} .note{background:var(--bg-soft);border:1px solid var(--border-soft);border-radius:var(--radius); padding:16px 18px;font-size:14px;color:var(--text-2);margin:22px 0} .note b{color:var(--text)} .nav{display:flex;flex-wrap:wrap;gap:8px;margin:34px 0} .nav a{font-size:13px;padding:7px 13px;border:1px solid var(--border);border-radius:999px; text-decoration:none;color:var(--text-2);background:var(--surface)} .nav a:hover,.nav a.on{border-color:var(--accent);color:var(--accent)} footer{margin-top:64px;padding:26px 0;border-top:1px solid var(--border-soft); font-size:13px;color:var(--text-3)} @media(max-width:640px){h1{font-size:31px}.hero{padding:36px 0 24px}} .hero-w{background:linear-gradient(135deg,var(--accent),var(--accent-bright));color:#fff;padding:2.4rem 20px 3.4rem;text-align:center} .hero-w h1{font-size:2rem;margin:0;letter-spacing:-.01em}.hero-w p{opacity:.9;margin:.4rem 0 0} .step-img{width:100%;border-radius:14px;object-fit:cover;max-height:340px} .step-kicker{font-family:var(--mono);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin:0} .step-h{font-size:1.35rem;margin:.3rem 0 .7rem;letter-spacing:-.01em} .step-p{color:var(--text-2);line-height:1.6} .reg{font-family:var(--mono);font-size:.8rem;color:var(--accent);background:var(--accent-dim);padding:.15rem .5rem;border-radius:6px} .szen{margin-top:1.2rem;background:var(--bg-soft);border:1px solid var(--border-soft);border-radius:16px;padding:1.1rem 1.2rem} .szen .mon{font-family:var(--mono);font-size:.75rem;color:var(--accent);margin:0 0 .3rem} .szen-grid{display:grid;grid-template-columns:180px 1fr;gap:1rem;align-items:center} .szen-img{width:100%;border-radius:12px;object-fit:cover} @media(max-width:560px){.szen-grid{grid-template-columns:1fr}} .calcbox{margin-top:1rem;background:var(--bg-soft);border:1px solid var(--border-soft);border-radius:16px;padding:1.1rem 1.2rem} .calcbox input{width:96px;padding:.35rem .5rem;border:1px solid var(--border);border-radius:8px;font-family:var(--mono);font-size:.95rem} #steps{display:flex;background:#fff;border:1px solid var(--border);border-radius:16px;overflow:hidden;margin-bottom:1.4rem;flex-wrap:wrap} .st .no{display:inline-flex;width:1.4rem;height:1.4rem;border-radius:50%;background:var(--border);color:var(--text-2);align-items:center;justify-content:center;font-size:.75rem;margin-right:.35rem} .st.on .no{background:var(--accent);color:#fff} .livebar{display:inline-flex;margin:1.2rem auto 0;padding:.5rem 1.1rem;background:rgba(255,255,255,.92);border:1px solid rgba(255,255,255,.5);border-radius:999px;font-size:.82rem;color:var(--text-2);align-items:center;gap:.5rem;box-shadow:0 6px 20px rgba(0,0,0,.08)} .livedot{width:.6rem;height:.6rem;border-radius:50%;background:#ea580c;box-shadow:0 0 0 0 rgba(234,88,12,.5);animation:lp 2s infinite} @keyframes lp{0%{box-shadow:0 0 0 0 rgba(234,88,12,.4)}70%{box-shadow:0 0 0 .5rem rgba(234,88,12,0)}100%{box-shadow:0 0 0 0 rgba(234,88,12,0)}} .livekpi{background:linear-gradient(135deg,var(--accent-dim),transparent);border:1px solid var(--accent-bright);border-radius:16px;padding:1.1rem 1.3rem;margin:.4rem 0 1rem} .livekpi .lv{font-size:2.2rem;font-weight:700;color:var(--accent);line-height:1;font-family:var(--mono)} .livekpi .ll{font-size:.9rem;color:var(--text-2);margin-top:.3rem} .livekpi .lts{font-size:.72rem;color:var(--text-3);font-family:var(--mono);margin-top:.4rem} .sec{max-width:1000px;margin:2.4rem auto;padding:0 20px} .sec h2{font-size:1.5rem;letter-spacing:-.01em;margin-bottom:.4rem} .sec .lead{color:var(--text-3);margin-bottom:1.2rem} .compgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(240px,1fr));gap:12px} .compgrid a{display:block;background:var(--surface);border:1px solid var(--border);border-radius:14px;overflow:hidden;text-decoration:none;color:inherit;transition:.16s} .compgrid a:hover{border-color:var(--accent-bright);box-shadow:0 8px 24px rgba(234,88,12,.14);transform:translateY(-2px)} .compgrid a img{width:100%;height:118px;object-fit:cover;display:block;background:#fff7ed} .compgrid .ct{padding:12px 15px} .compgrid b{display:block;font-size:14.5px}.compgrid span{font-size:12px;color:var(--text-3);font-family:var(--mono)} .ctaband{background:linear-gradient(135deg,var(--accent),var(--accent-bright));color:#fff;text-align:center;padding:2.6rem 20px;margin-top:2.4rem} .ctaband h2{font-size:1.6rem;margin-bottom:.6rem}.ctaband p{opacity:.92;max-width:60ch;margin:0 auto 1.4rem} .ctaband .btn{display:inline-block;background:#fff;color:var(--accent);font-weight:600;padding:.7rem 1.4rem;border-radius:999px;text-decoration:none;margin:.3rem} .faqsec details{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:.4rem 1rem;margin-bottom:.6rem} .faqsec summary{cursor:pointer;font-weight:600;padding:.6rem 0;font-size:.98rem} .faqsec .faq-a{color:var(--text-2);padding:0 0 .8rem;line-height:1.6} .live-head{display:flex;align-items:center;gap:.7rem;flex-wrap:wrap;margin:.2rem 0 1.1rem} .live-status{font-weight:800;font-size:1.05rem}.live-sub{color:var(--text-3);font-size:.82rem} .kpis{display:grid;grid-template-columns:repeat(3,1fr);gap:.7rem} .kpi{background:linear-gradient(180deg,#fff,var(--bg-soft));border:1px solid var(--border);border-radius:15px;padding:.85rem .95rem} .kpi .kl{font-size:.72rem;letter-spacing:.03em;text-transform:uppercase;color:var(--text-3);font-weight:700} .kpi .kval{font-family:var(--mono);font-weight:700;font-size:1.4rem;color:var(--text);line-height:1.1;margin-top:.15rem} .kpi .kval .ku{font-size:.72rem;color:var(--accent);margin-left:.15rem} .kpi .spark{margin-top:.35rem;height:26px} .kpi.hl{border-color:var(--accent-bright);box-shadow:0 6px 18px rgba(234,88,12,.14)} @media(max-width:640px){.kpis{grid-template-columns:repeat(2,1fr)}} header.site{position:sticky;top:0;z-index:9;background:rgba(255,255,255,.85);backdrop-filter:saturate(180%) blur(18px);border-bottom:1px solid var(--border-soft)} .navrow{display:flex;align-items:center;gap:1rem;height:56px} .brand{font-weight:800;letter-spacing:-.02em;color:var(--text);text-decoration:none;font-size:1.02rem} .nlinks{display:flex;gap:1.1rem;margin-left:auto}.nlinks a{color:var(--text-2);text-decoration:none;font-size:.86rem} .nlinks a:hover{color:var(--accent)} .navcta{background:var(--accent);color:#fff;text-decoration:none;font-weight:700;font-size:.82rem;padding:.5rem 1rem;border-radius:999px} @media(max-width:640px){.nlinks{display:none}} footer.site{margin-top:3rem;padding:2.4rem 0;border-top:1px solid var(--border-soft);background:var(--bg-soft);text-align:center} .fbrand{font-weight:800;color:var(--text);margin-bottom:.4rem} .fclaim{color:var(--text-2);font-size:.9rem;max-width:52ch;margin:0 auto 1rem} .flinks{display:flex;gap:1.2rem;justify-content:center;flex-wrap:wrap;margin-bottom:1rem} .flinks a{color:var(--accent);text-decoration:none;font-size:.85rem} .fcopy{color:var(--text-3);font-size:.78rem} .wiz-wrap{position:relative;z-index:2;margin:-2.6rem auto 0;max-width:1000px;padding:0 20px 2rem} .wiz{background:#fff;border:1px solid var(--border,#fed7aa);border-radius:24px;box-shadow:0 2px 6px rgba(0,0,0,.05),0 30px 70px rgba(249,115,22,.10),0 0 0 1px rgba(249,115,22,.03);overflow:hidden} .wiz-steps{display:flex;gap:0;border-bottom:1px solid var(--border,#fed7aa);background:var(--bg-mute,#fff7ed)} .wiz-steps .st{flex:1;display:flex;align-items:center;justify-content:center;gap:.5rem;padding:.85rem .6rem;font-size:.82rem;font-weight:700;color:var(--text-3,#86868b);position:relative;cursor:pointer} .wiz-steps .st .no{width:22px;height:22px;border-radius:999px;background:#e5e0ee;color:#86868b;display:flex;align-items:center;justify-content:center;font-size:.72rem;font-weight:800;flex:0 0 auto} .wiz-steps .st.on{color:var(--accent)} .wiz-steps .st.on .no{background:var(--accent);color:#fff} .wiz-steps .st.done .no{background:#ea580c;color:#fff} .wiz-steps .st.on::after{content:"";position:absolute;left:0;right:0;bottom:-1px;height:3px;background:var(--accent)} .wiz-steps .st .lbl{display:none} .wiz-steps .st{padding:.8rem .3rem} .wiz-body{padding:1.6rem 1.7rem 1.9rem} .wiz-body{padding:1.2rem 1.1rem 1.5rem} .step-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:1.5rem;align-items:center} .step-grid{grid-template-columns:1fr;gap:1.1rem} .step-img{width:100%;aspect-ratio:4/3;object-fit:cover;border-radius:16px;display:block;box-shadow:0 14px 34px rgba(249,115,22,.14)} .step-kicker{font-size:.76rem;letter-spacing:.12em;text-transform:uppercase;color:var(--accent);font-weight:800;margin:0 0 .5rem} .step-h{font-size:clamp(1.35rem,2.6vw,1.7rem);font-weight:800;letter-spacing:-.01em;margin:0 0 .7rem;color:var(--text,#1d1d1f);line-height:1.16} .step-p{font-size:1.02rem;line-height:1.62;color:var(--text-2,#515154);margin:0 0 .8rem} .step-p b{color:var(--text,#1d1d1f)} .chk{list-style:none;padding:0;margin:.4rem 0 0} .chk li{display:flex;gap:.6rem;align-items:flex-start;font-size:.98rem;line-height:1.5;color:var(--text-2,#515154);margin:.55rem 0} .chk li .b{flex:0 0 auto;width:22px;height:22px;border-radius:999px;background:var(--accent-dim);color:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:800;font-size:.8rem;margin-top:.05rem} .wiz-nav{display:flex;justify-content:space-between;align-items:center;gap:.8rem;margin-top:1.5rem;flex-wrap:wrap} .wiz-back{background:none;border:0;color:var(--text-3,#86868b);font-weight:700;font-size:.95rem;cursor:pointer;padding:.6rem .2rem} .wiz-back:hover{color:var(--text,#1d1d1f)} .wiz-next{background:linear-gradient(135deg,var(--accent),var(--accent-bright));color:#fff;border:0;border-radius:999px;padding:.85rem 1.6rem;font-weight:800;font-size:1rem;cursor:pointer;box-shadow:0 10px 26px rgba(249,115,22,.28);text-decoration:none;display:inline-flex;align-items:center;gap:.5rem} .wiz-next:hover{transform:translateY(-1px)} .benefit{background:linear-gradient(135deg,#fff7f0,#fff);border:1px solid var(--accent-ultra);border-radius:18px;padding:1.3rem 1.4rem;margin:.2rem 0 1.1rem} .benefit h3{margin:0 0 .5rem;font-size:1.2rem;font-weight:800;color:var(--text,#1d1d1f)} .benefit p{margin:0;color:var(--text-2,#515154);line-height:1.6}</style></head><body> <header class="site"><div class="wrap navrow"> <a class="brand" href="/glaesern/piscine/">◈ Clear pool</a> <nav class="nlinks"><a href="/glaesern/piscine/">All trades</a> <a href="https://stromfee-mauritius.ai/glaesern/piscine/filtration.html">Filtration & Circulation</a></nav> <a class="navcta" href="#kontakt">System check →</a></div></header> <div class="hero-w"><h1>Pre-filter / hair strainer</h1><p>Component assistant · Filtration & Circulation</p> </div> <div class="wiz-wrap"> <div id="steps"> <div class="st" data-s="1"><span class="no">1</span> Comprendre </div> <div class="st" data-s="2"><span class="no">2</span>View live</div> <div class="st" data-s="3"><span class="no">3</span>What the AI does</div> <div class="st" data-s="4"><span class="no">4</span>Your benefit</div> </div> <div id="body"></div> </div> <div class="sec"><div class="block"><h3>Thus we connect — read only</h3><p class="step-p">The value comes from<b>Modbus TCP · GLT · Dosing technique</b>of the system —<b>read, not controlled</b>. Everything is<b>in-house</b>calculated, nothing leaves the house. No obligation to transmit operational data.</p></div><div class="block"><h3>Your own pool LLM — offline</h3><p class="step-p">Natural language questions, answered by AI<b>Your own system data</b>— local, no Cloud. The AI runs in-house; the system remains private.</p></div><div class="note"><b>Regulatory framework:</b>Installation technique / Energy efficiency</div><div class="block"><h3>Link with the entire installation</h3><p class="step-p">Filtration, heating, water treatment and ventilation are linked — AI considers the pool as a system.</p><div style="display:flex;gap:.6rem;flex-wrap:wrap;margin-top:.6rem"><a href="/glaesern/bess/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">BESS in glass →</a><a href="/glaesern/hotel/" style="font-size:.85rem;padding:.4rem .9rem;border:1px solid var(--border);border-radius:999px;text-decoration:none;color:var(--accent)">Glass hotel →</a></div></div></div><div class="sec faqsec"><h2>FAQ</h2><details><summary>What is the function of a hair sieve in a swimming pool?</summary><div class="faq-a">The hair sieve filters coarse particles and hair from the water flow before they reach the main filtration system or the circulation pumps.</div></details><details><summary>Why must the hair sieve be cleaned regularly?</summary><div class="faq-a">Blocked sieves increase backpressure in the system, leading to pump overload and a decrease in flow volume.</div></details><details><summary>How to identify an obstruction in the pre-filter?</summary><div class="faq-a">An increase in differential pressure between the inlet and outlet zones of the filter is the technical indicator of contamination.</div></details><details><summary>From when should the hair sieve be maintained?</summary><div class="faq-a">Maintenance is required as soon as the differential pressure exceeds a defined limit value or if visual inspection shows an accumulation of materials.</div></details><details><summary>What is the impact of the hair sieve on energy efficiency?</summary><div class="faq-a">A clear hair sieve minimizes resistance in the system, allowing the circulation pump to pump the required volume with lower energy consumption.</div></details><details><summary>Why is remote monitoring of the pre-filter useful?</summary><div class="faq-a">It allows for maintenance tailored to needs and prevents emergencies caused by pump overheating due to blockages in the pre-filter.</div></details></div> <footer class="site"><div class="wrap"> <div class="fbrand">◈ Transparent pool</div> <p class="fclaim">Connected in read-only mode · local calculation · no Cloud. The system remains in the house.</p> <nav class="flinks"><a href="/glaesern/piscine/">All trades</a> <a href="https://stromfee-mauritius.ai/glaesern/piscine/filtration.html">Filtration & Circulation</a> <a href="https://bhkw-anlagen.com/impressum.html">Legal notice</a> <a href="https://bhkw-anlagen.com/datenschutz.html">Data protection</a></nav> <div class="fcopy">© 2026 HR Energiemanagement GmbH · 32257 Bünde · +49 5223 4921030</div> </div></footer> <script> var state={step:1}; function li(t){return '<li>'+t+'</li>';} function nav(s){var b=s>1?'<button class="wiz-back" onclick="go('+(s-1)+')">← Back</button>':'<span></span>'; var n=s<4?'<button class="wiz-next" onclick="go('+(s+1)+')">Next →</button>':'<button class="wiz-next" onclick="go(1)">From the beginning</button>'; return '<div class="wiz-nav">'+b+n+'</div>';} function step1(){return '<div class="step-grid"><img class="step-img" src="../img/filtration.jpg" alt="Pre-filter / hair sieve">'+ '<div><p class="step-kicker">Step 1 · Understand</p><h2 class="step-h">What is a pre-filter / hair sieve?</h2>>'+ '<p class="step-p">The hair sieve serves as the primary mechanical barrier in the pre-filter area of a swimming pool operation to remove coarse impurities and hair from the circuit. It protects the downstream filtration system from material accumulation and prevents the clogging of pipes. Efficient functioning of the hair sieve is essential for maintaining water quality and protecting pump performance.</p></div></div>'+nav(1);} function step2(){return '<div class="step-grid"><div><p class="step-kicker">Step 2 · See live</p><h2 class="step-h">No own register — honestly</h2><p class="step-p">For this component, <b>no own register</b> is connected; therefore, no example value is intentionally provided here. Where the system measures, the value is read as read-only and calculated in-house. It becomes visible via the connected components.</p></div><img class="step-img" src="../img/filtration.jpg" alt="System"></div>'+nav(2);} function step3(){return '<div class="step_grid"><div><p class="step-kicker">Step 3 · What the AI does</p>'+ '<h2 class="step-h">What the AI reads from this component</h2><ul class="chk">'+li('Detection of <b>material accumulation</b> to avoid flow resistance')+li('Indication of the <b>degree of filter obstruction</b> by measuring differential pressure in the pre-filtration zone')+li('Monitoring of the <b>circulation volume</b> to prevent pump overheating')+li('Early warning of <b>contamination peaks</b> that impair filtration performance')+'</ul></div>'+ '<img class="step-img" src="../img/filtration.jpg" alt="KI beobachtet"></div>'+ '<div class="szen szen-grid"><div><p class="mon">Monitoring: Pressure difference & flow rate per hour</p>'+ '<p class="step-p"><b>The scenario:</b> Blocked filter or continuous operation of the pump at full speed. Up to 35 % of the pool\'s electricity is consumed for unregulated circulation<br>'+ '<b>The AI:</b> The AI adjusts the speed according to actual demand and reports the backwash time based on differential pressure. <b>It detects the trend before the limit value is reached.</</b></p></div></div>'+nav(3);} function step4(){return '<p class="step_kicker">Step 4 · Your benefit</p><h2 class="step-h">Why does this matter?</h2>>'+ '<div class="benefit"><h3>Proactive monitoring reduces downtime caused by blockages and lowers the energy demand of the circulation pump.</h3><p>Reducing manual inspection rounds optimises staffing resources in pool operations. Furthermore, clean pre-filtration significantly extends the lifespan of filter media and pump components.</p></div>'+ '<div class="calcbox"><p class="step-p">Pump power (kW) <input id="c0" type="number" step="any" value="8" oninput="r()"> · Filter runtime (h/day) <input id="c1" type="number" step="any" value="12" oninput="r()"> · Season length (days/yr) <input id="c2" type="number" step="any" value="300" oninput="r()"> · Speed reduction (%) <input id="c3" type="number" step="any" value="35" oninput="r()"> · Electricity price (ct/kWh) <input id="c4" type="number" step="any" value="22" oninput="r()"> → <b><span id="o" style="color:var(--accent)">—</span> €/year</b></p>'+ '<p class="mon" style="margin-top:.5rem">Calculation: Pump power × Speed reduction × Electricity price — speed control reduces consumption disproportionately.</p></div>'+nav(4);} function r(){var v=[];for(var i=0;i<5;i++){var e=document.getElementById('c'+i);v.push(e?parseFloat(e.value)||0:0);}'o');if(o)o.textContent=(Math.round(res*100)/100).toLocaleString('de-DE');}'body').innerHTML=state.step===1?step1():state.step===2?step2():state.step===3?step3():step4();'#steps .st').forEach(function(el){var n=+el.getAttribute('data-s');el.classList.toggle('on',n===state.step);el.classList.toggle('done',n<state.step);});'smooth'});} document.querySelectorAll('#steps .st').forEach(function(el){el.style.cursor='pointer';el.onclick=function(){go(+el.getAttribute('data-s'));};}); render(); </script></body></html>