Eclipse3 is an all-natural mineral based way to combat algae and bacteria growth. This granular algaecide reduces sanitizer use, clarifies your pool water and helps maintain proper PH levels. This algaecide contains both Copper Sulfate and Tetra Borate. For the startup dosage, use 20 oz. per 10,000 gallons. Then only 1.25 oz. per 10,000 gallons to maintain your pool.