API POND SIMPLY CLEAR, 16 OZAPI POND SIMPLY CLEAR bacterial cleaner is a natural bacterial based pond clarifier that quickly clears cloudy water and keeps it clear. This triple action formula works fast to clear pond water, consume sludge, and break down algae, offering a long term solution to murky water. For initial dose at spring start up and end of season dose, add 0. 5 cup per 500 gallons of pond water twice a week for 2 weeks. For maintenance dose, add 4 tbsp. per 500