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How to test for cyanuric acid
Make sure your state allows cyanuric acid.
Every state has different laws and different levels they allow, from 30 ppm as the maximum to 100 ppm as the maximum. It's essential you know what you are testing for, depending on your location.
Understand the benefit of cyanuric acid. In the right amounts, cyanuric acid protects the chlorine in a pool from ultraviolet sunlight, thereby reducing the amount of chlorine lost over time.