Aquavet Copper Sulfate Algae Control Treatment for killing floating, submerged and planktonic algae in ponds and lakes. Use 2.5 to 4 lb granuales per acre mixed with 10 gallons of water. Dissolve completely and sparay over top of algae mats. Do not treat more than 1/4 to 1/3 of the surface area of a pond at one time to avoid oxygen depletion due to vegetation death Wait 7 to 10 days between treatments. Retreatment during season will be needed. Treat algea in early stages.