Even new-fangled salt water systems can't quit chlorination.
Over the years, chlorine alternatives—or at least what seem like chlorine alternatives—have gone to market. In 1919, according to Olsen, at least one luxury hotel was advertising ultraviolet purification. “No Chlorine, no Chemicals,” the ads said. And in the 1920s, pool owners dabbled in ozone, that carefully-regulatedThis ancient swimming pool was part of a larger bath complex in the ancient city of Minturnae, Italy.
On the Periodic Table of Elements, basic salt is classified as NaCl, or sodium chloride. When dissolved in water, salt breaks down into salt and chlorine. If you have a salt water filtration system and add salt to your pool, the NaCl is pulled through a special cell made of titanium plates coated in ruthenium, a powerful catalyst. The cell stimulates a chemical reaction, creating chloride ions. When oxidized, these ions form Cl, or chlorine gas.
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