A very good option to take care of clean and healthy pools, spas, and hot tubs. Proven to accomplish extremely well in three main areas; it gets rid of algae growth and decreases your use of chlorine, clarifies the water even as keeping up right kind pH level and decreases electrical operating costs by up to 66%. Maintenance Dosage: 1.25 oz. per 10,000 gallons. Initial Dosage: 20 oz per 10,000 gallons.