Copper Sulfate – Dry copper sulfate granules for pond algae control 
DO NOT treat more than 1/4-1/3 of the surface area of pond at one time to avoid oxygen depletion due to vegetation death. Wait 7- 10 days between treatments
Re-treatment during season will be needed
Treat when algae is in early stages 100% safe water use immediately
Do not use in koi or trout ponds - Toxicity is directly related to water softness