Check the listing for details. API Aqua Essential 4oz Concentrated All-in-One Aquarium Water Conditioner. Condition: New. Listed at 11.99 USD. API Aqua Essential 4oz All-in-One Concentrated Water Conditioner that makes tap water safe for fish by removing all harmful chemicals.WORKS INSTANTLY: Highly concentrated aquarium treatment works instantly to remove harmful chemicals, making tap water safe for fish in freshwater and saltwater aquariums; Reduces the risk of fish loss when starting or maintaining a fish tankDECHLORINATOR: Removes chlorine, chloramines, heavy metals which are found in tap water and can cause gill and tissue damage, breathing difficulty, stress and fish deathAMMONIA DETOXIFIER: Detoxify 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 fishNITRITES 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 growthSize: 4 oz.