08/06/2026
Wondering why your pool turned green even though you've been adding 3" chlorine tablets?
The short answer: your CYA (stabilizer) may be too high.
Every 3" stabilized chlorine tablet adds chlorine, but it also adds cyanuric acid (CYA). On average, each tablet can increase CYA by about 3 ppm in a 10,000-gallon pool.
Now think about using 3โ4 tablets every week. Over the course of a month, your CYA can climb quickly. As CYA gets too high, your chlorine becomes less effective, making it much harder to keep algae under controlโeven if your test kit shows you have chlorine in the water.
The result? A green pool, wasted chemicals, and frustration.
At JP's Complete Pool Solutions, we can test your water, explain what's happening, and help you choose the right chlorination method to keep your pool clear without excessive CYA buildup. We also offer Pool School and can discuss our 12.5% liquid chlorine injection system, which helps maintain consistent sanitation without continuously adding stabilizer.
Have questions about your pool chemistry? Reach out todayโwe're happy to help!