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Hot tub chemical stores always tell you to use bromine instead of chlorine. They claim chlorine will destroy your tub. I have been using chlorine for 20+ years on 3 different tubs. Never had a problem. I suspect they recommend bromine only because it’s more expensive.
Bromine has a higher boiling point than chlorine, which allows it to stay in the hot water longer. You can use chlorine in a hot tub, but you have to add it more frequently to achieve the proper level of sanitization.
Maybe, but I’ve never had an issue with satiation using chlorine.