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Fast acting copper-free algaecide effectively controls unsightly pond algae. CrystalClear Algae D-Solv features a 5.4% active ingredient that targets string algae blanketweed and green water caused by single-celled algae. Great for use in self-contained ornamental goldfish and koi ponds waterfalls water gardens and fountains. Will not harm fish and live plants when used as directed. 16 oz CrystalClear Algae D-Solv treat 5760 gallons. Attention: In ponds ensure that water is well aerated via waterfall fountain or other method to prevent fish loss. Aeration must be continuous. Not safe for use with snails shrimp clams and other crustaceans or mollusks.