API Aqua Essential Water Conditioner is a highly concentrated all-in-one water conditioner which instantly makes tap water safe for fish by removing harmful chlorine and chloramine as well as detoxifying heavy metals commonly found in tap water. Aqua Essential Water Conditioner can also be used to instantly remove toxic ammonia, nitrate and nitrite in freshwater, saltwater and planted aquariums. Toxic ammonia is continually released by fish through their gills, urine and solid waste. Uneaten food and decaying organic matter also add ammonia to an aquarium. Low levels of ammonia can stress fish whilst high levels of ammonia can cause fish health issues and even fatalities. The unique formula in API Aqua Essential Water Conditioner binds with ammonia, nitrite, and nitrate rendering them non-toxic and allowing the biofilter to more efficiently remove them. Directions:Add 5ml per 189 litres of aquarium water to treat tap water. Add 5ml per 38 litres of aquarium water to remove ammonia, nitrite, and nitrate - Add every 24 hours if needed