Naturally promote a healthy aquatic environment with TotalPond Pond Cleaner Tablets. It utilizes a blend of beneficial bacteria, enzymes, and natural barley to break down fish waste, phosphates, nitrates, and other water pollutants. It's ideal for use when pond water is murky, opening your pond in spring and closing in winter. One tablet treats up to 200 gallons of water, continuously cleaning the water for up to 2 weeks. Add one tablet per 200 gallons directly to pond water while water temperatures are above 50°F. One pack includes 4 tablets, which treats a total of 800 gallons of water. TotalPond Pond Cleaner Tablets is an environmentally safe product. When used as directed, this product is safe for fish, plants, domestic and wildlife animals.