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), …

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 …

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 …

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 …

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...

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 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 …

Apr 25, 2024 · Brand new pool was plastered and filled about 2 weeks ago. We've been brushing, adjusting pH, alkalinity, and chlorine levels. The salt is being added in 2 more weeks. Currently CYA …

Aug 2, 2018 · I’m struggling to balance my pool water. I performed a SLAM for almost a week and passed the OCLT, the water still won’t hold chlorine under sunlight, but looks clear and crystal. This …

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?