Mars Fishcare PONDCARE Microbial Algae Clean Green Water Biological Inhibitor Contains one (1) PONDCARE MICROBIAL ALGAE CLEAN Green Water Biological Inhibitor 64-Ounce Bottle Controls green water algae in water gardens containing live plants and fish Eliminates troublesome organic sludge and debris and reduces noxious pond odors Biologically inhibits green water to keep pond water clean and clear in ornamental ponds and water gardens Use twice a week for two weeks then once a week to maintain green water algae control