GreenClean is a granular peroxide based algaecide (Sodium Carbonate Peroxhydrate). It is one of the few algaecides that does not contain copper so it is safe to use in smaller koi ponds. It should be sprinkled directly on nuisance algae and it will begin to release oxygen as it controls algae growth and biodegrades. Application rate is 3-17 pounds per acre-foot, depending on the resiliency of the algae.
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