The traditional method of sanitization is the use of chlorine, which not only eliminates bacteria but is also able to break down organic debris through oxidation.
Chlorine comes in liquid form, though this is not commonly used for home pools; granular form, which is dissolved before being added to pool water; and tablet form, which is placed in a floating feeder that slowly dissolves and then releases the chlorine into the pool. The chlorine, in reaction with the pool water, produces hypochlorous acid, or what is called “free chlorine,” which is actually what sanitizes the water. But, free chlorine degrades rapidly in sunlight, so cyanuric acid, which stabilizes the compound, is added with the chlorine.
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