About this item Contains one (1) API POND ALGAEFIX Algae Control 1-Gallon Bottle; treats up to 38,400 U.S Gallons Helps resolve algae problems and controls the formation of new algae; works fast; effectively controls most types of algae including green water (Chlorella), string and hair algae (Cladophora), blanket weed algae (Oedogonium) in ponds, koi ponds and fountains This EPA-registered pond algaecide will not harm fish, plants, surrounding wildlife and pets when used as directed Does not contain copper Before use, make certain that the pond/fountain has vigorous aeration; thoroughly mix into pond/fountain water and disperse evenly; Repeat dose every three days until algae is controlled; dose weekly to keep pond or fountain clean and clear and to reduce maintenance › See more product details