Pond Zyme Sludge Destroyer, 8-oz.Contains one (1) API POND ZYME SLUDGE DESTROYER Pond Water Cleaner With Barley 8 Ounce Container 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 in ornamental ponds for start up and end of season, then once every two weeks for regular maintenance