Contains one (1) API AQUA ESSENTIAL Water Conditioner 237ml bottle, treats up to 2,370 U.S. Gallons (8,971 Litres) WORKS INSTANTLY: Highly concentrated aquarium treatment works instantly to remove harmful chemicals, making tap water safe for fish in freshwater, saltwater and planted aquariums, Reduces the risk of fish loss when starting or maintaining a fish tank DECHLORINATOR: Removes chlorine, chloramines, heavy metals which are found in tap water and can cause gill and tissue damage, breathing difficulty, stress and fish death AMMONIA REMOVER: Removes the toxic ammonia continually released by fish through their gills, urine and solid waste. Uneaten food and decaying organic matter also add ammonia. Small amounts of ammonia stress fish, large amounts of ammonia will kill fish NITRITES AND NITRATES REMOVER: Produced by fish waste and uneaten fish food, nitrites inhibit respiration and suppress the immune system at low levels, while high levels cause suffocation, Nitrates can be harmful to fish and lead to algae growth