May 18, 2026
Permit/Opening
21 - cyanuric acid level not exceeding maximum
Regulation: 511-3-5-.17(4) - (4) stabilizer (if used) cyanuric acid,ppm ideal: 30-50 maximum: 90 comments: if stabilizer is: too high: - may reduce chlorine efficacy too low: - chlorine residual rapidly destroyed by sunlight note: stabilizer is not needed in indoor or br
The cyanuric acid level exceeds the maximum allowance of 90 ppm. Reduce CYA to get maximum effectiveness of the chlorine. Stabilizer (if used) Cyanuric acid, ppm Ideal: 30-50 Maximum: 90 Comments: If stabilizer is: Too High: - May reduce chlorine efficacy Too Low: - Chlorine Residual rapidly destroyed by sunlight Note: Stabilizer is not needed in indoor or brominated pools and spas.