Patent ID: 6852238

Claim:
A solid, multi-layer water treatment tablet comprising one discrete layer containing at least one halogen source and a second discrete layer containing at least one pH compensating source, wherein the halogen source is acid in an aqueous solution and the pH compensating source is basic in aqueous solution, wherein the halogen source is selected from the group consisting of, anhydrous sodium dichloroisocyanuric acid, tribromoisocyanuric acid, dibromoisocyanuric acid, monobromoisocyanuric acid, monobromodichloroisocyanuric acid, dibromomonochloroisocyanuric acid, 1,3dichloro-5,5-dimethylhydantoin, 1,3-dibromo 5,5-dimethylhydantoin, 1-bromo-3-chloro-5,5-dimethylhydantoin, 1,3-dichloro-5-methyl-5-ethylhydantoin, 1,3-dichloro-5,5-dimethylhydantoin, 1,3-dibromo-5,5-dimethylhydantoin, trichloromelamine, tribromomelamine and mixtures thereof.