EPA registration No. 10876-1. Cleans fixtures of all organic material. Removes lime and mineral deposits without brushing. Minimizes mineral concentration in tanks. Prolongs life of fittings and fixtures. Doesn't color water and water isn't harmful to children or pets when used as recommended. Lasts up to 4 months or more. Contains granular chlorine in an exclusive patent. No. 03001: 7 oz. regular No. 02001: 14 oz. heavy-duty