Contains one (1) API POND ECOFIX SLUDGE DESTROYER Pond Water Clarifier 16-Ounce Bottle. Contains natural active ingredients to break down fish waste and consume pond sludge. Breaks down dead algae and digests leaves and grass clippings. Helps to reduce overall pond maintenance and keep pond clean. Use twice a week for two weeks for initial dose , quick clean up and end of season, and once every other week for maintenance