Sep 1, 2025 · Stabilizer (Cyanuric Acid or CYA) CYA protects your free chlorine (FC) from the sun, reducing the amount of chlorine you need to add daily. Too much CYA (more than about ~90 ppm), …

Jan 4, 2025 · CYA Testing Follow the instructions for CYA Testing in Pool School. Read all of the notes in the Pool School article. Many people find the CYA test the most difficult to interpret and get …

Feb 26, 2025 · Cyanuric acid (CYA) is the chemical name for the product commonly called “pool water stabilizer” or “pool water conditioner ”. CYA protects free chlorine (FC) from the sun and protects …

Jun 28, 2012 · The main problem with the higher CYA is that it reduces the active chlorine level allowing algae to grow faster than chlorine can kill it. You can compensate for this by raising the FC level as …

Aug 6, 2007 · EDIT: You will find a simplified and standardized version of this chart at Pool School, Chlorine / CYA Chart. Chlorine/CYA Chart by Chemgeek FC = Free...

Dec 13, 2009 · Cyanuric Acid and Alkalinity. I'm not sure if this has been posted elsewhere and I've read quite a few posts but not seen it mentioned. I read a paper some time ago regarding the Total …

Jul 27, 2025 · What is Free Chlorine in a Pool? Free chlorine, as measured by a TFP recommended test kit, is the sum of two forms of chlorine in your pool water - active chlorine (the chlorine compounds …

Jun 7, 2017 · Pouring granular CYA into the pool directly, or into the skimmer as recommended on stabilizer bottles, is not recommended as it takes a long time to dissolve and the granules can sit …

May 4, 2009 · Why doesn't anyone manufacture 3" chlorine tabs without CYA in them? Is it not possible? Or if someone does, where can I buy it?

Dec 12, 2018 · There are several items things every pool owner should know about swimming pool water. We share details on the basics of Pool Water Chemistry.