...Hayward and others also sell equipment that generates chlorine from salt via electrolysis. These systems offer the benefits of a chlorinated, clean pool without many of the annoyances, including the harsh chemical smell and itchy eyes. Another option is ultraviolet light or ozone-based sanitizing technology — or some combination of the two. These systems blast viruses and certain bacteria that are resistant to chlorine. They are more common in large, commercial pools but are gaining ground in residential settings, particularly as the pandemic heightens awareness of how the body is exposed to particulates and pathogens, Baker of Hayward said. Some chlorine is still needed as a supplement but with the UV and ozone systems doing the heavy lifting, pools don't need nearly as much to stay clean.
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