Cyanuric acid is mostly used in outdoor pools. The reason for this is that chlorine is broken down by ultra violet light. Sunlight contains ultra violet light and when the sun shines onto an outdoor pool the chlorine gets depleted very quickly. The pool plant operator needs a way of 'stabilising' the chlorine and that's where cyanuric acid comes in. Cyanuric acid binds with the hypochlorous acid (the disinfectant in chlorine) and makes it more resistant to degradation by UV. The drawback is t...
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