Algone Water Clarifier and Nitrate Remover cleans your aquarium in no time Algone Water Clarifier and Nitrate Remover cleans aquarium water while issuing no harmful effects on aquatic plants or fish. Clears and prevents cloudy or green waterRemoves nitrates and ammoniaSimplifies tank maintenance and fixes "ugly" tanksSafe for freshwater or saltwater aquariumsThis product removes the cloudiness of water and completely cleans green water. This unique product works for both fresh and saltwater and features Algone as the main active ingredient that absorbs pollutants and toxins while maintaining a proper nutrient balance and proper biological and chemical levels in your aquarium water. Sizing:Small: Use in tanks 5 to 110 gallonsLarge: Use in tanks 110 gallons and up