Compare to Strike Out®, Swimtrine Plus®, Sun® Copper Algaecide and MSA® Algaecide. Top quality algaecide eliminates all types of stubborn algae growth, even mustard and black algae. Will not foam or cloud water. Maintains a long lasting residual to keep on killing after initial application. 1 bottle treats 160,000 gallons. Contains 7% Chelated copper. Use 2oz. per 10,000 gallons.