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Bromine tablets. These tablets typically contain 1,3-dibromo-5,5-dimethylhydantoin (DBDMH), a compound that releases ions containing bromine (Br) when added to water. It is used to disinfect water and is often used in spas and hot tubs. A similar chemical is bromo-3-chloro-5,5-dimethyl hydantoin (BCDMH), which releases ions containing both chlorine and bromine.
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