Chlorine is often used with ultraviolet and ozone purification systems at reduced levels, though not always (the ozone purified Volanta Park Indoor/Outdoor Pool in Fairhope, Alabama being one example).

According to this post in the forums, UV also breaks down "the negative by-product of using chlorine, combined chlorine; otherwise known as chloramines. One type of chloramine, trichloramine, is primarily responsible for the smell, odor, skin irritation, corrosion to the indoor facility, and athletic asthma on swim teams…."

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