1.0Pool Chemical Calculatorhttps://poolchemicalcalculator.com/newsLarry Clawsonhttps://poolchemicalcalculator.com/news/author/larryclawson/rich600338<blockquote class="wp-embedded-content" data-secret="GcsfwhIyCG"><a href="https://poolchemicalcalculator.com/news/why-does-pool-chlorine-disappear-fast/">Why Does Pool Chlorine Disappear Fast? The Real Reasons Your Pool Keeps Eating Chlorine</a></blockquote><iframe sandbox="allow-scripts" security="restricted" src="https://poolchemicalcalculator.com/news/why-does-pool-chlorine-disappear-fast/embed/#?secret=GcsfwhIyCG" width="600" height="338" title="“Why Does Pool Chlorine Disappear Fast? The Real Reasons Your Pool Keeps Eating Chlorine” — Pool Chemical Calculator" data-secret="GcsfwhIyCG" frameborder="0" marginwidth="0" marginheight="0" scrolling="no" class="wp-embedded-content"></iframe><script type="text/javascript"> /* <![CDATA[ */ /*! This file is auto-generated */ !function(d,l){"use strict";l.querySelector&&d.addEventListener&&"undefined"!=typeof URL&&(d.wp=d.wp||{},d.wp.receiveEmbedMessage||(d.wp.receiveEmbedMessage=function(e){var t=e.data;if((t||t.secret||t.message||t.value)&&!/[^a-zA-Z0-9]/.test(t.secret)){for(var s,r,n,a=l.querySelectorAll('iframe[data-secret="'+t.secret+'"]'),o=l.querySelectorAll('blockquote[data-secret="'+t.secret+'"]'),c=new RegExp("^https?:$","i"),i=0;i<o.length;i++)o[i].style.display="none";for(i=0;i<a.length;i++)s=a[i],e.source===s.contentWindow&&(s.removeAttribute("style"),"height"===t.message?(1e3<(r=parseInt(t.value,10))?r=1e3:~~r<200&&(r=200),s.height=r):"link"===t.message&&(r=new URL(s.getAttribute("src")),n=new URL(t.value),c.test(n.protocol))&&n.host===r.host&&l.activeElement===s&&(d.top.location.href=t.value))}},d.addEventListener("message",d.wp.receiveEmbedMessage,!1),l.addEventListener("DOMContentLoaded",function(){for(var e,t,s=l.querySelectorAll("iframe.wp-embedded-content"),r=0;r<s.length;r++)(t=(e=s[r]).getAttribute("data-secret"))||(t=Math.random().toString(36).substring(2,12),e.src+="#?secret="+t,e.setAttribute("data-secret",t)),e.contentWindow.postMessage({message:"ready",secret:t},"*")},!1)))}(window,document); /* ]]> */ </script> https://poolchemicalcalculator.com/news/wp-content/uploads/2026/04/de-filter-vs-sand-filter-vs-cartridge.png10241024You add chlorine. You test later. And somehow it’s gone. That usually means one of five things is happening: the sun is burning it off, your cyanuric acid is too low, algae or contaminants are consuming it, your pool is getting hammered by swimmers or heat, or your chemistry is making chlorine work harder than […]