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Dry copper 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.