CrystalClear® MuckOff™ tablets are designed to sink to the bottom of the pond to quickly reduce muck and sludge caused from dead algae, leaves and twigs. MuckOff™ easy-to-use tablets are a blend of natural bacteria and enzymes that help clear water by removing excess nutrients and reducing sediment. Use when water temperatures are above 50°F. 96 tablets will treat a 4,000 gallon pond for up to 4 months_x000D_ _x000D_ _x000D_