API Tap Water Conditioner API has been an industry leader in fish care, nutrition, treatments, testing and pond products for over 50 years, giving them a keen insight into your aquarium and its needs - making them the clear choice for fish enthusiasts around the world. API Tap Water Conditioner treatment removes toxins from tap water instantly, so you can add fish to your aquarium (or add them back after a water change) immediately. This treatment dechlorinates aquarium and tap water, detoxifies heavy metals, and may be used in both fresh and salt water. The super-concentrated formula treats up to 2727L with just one 30ml dose, making your aquarium a safe environment for your fish. Water conditioner Makes tap water safe for fish Dechlorinates tap water, removing heavy metals Suitable for both fresh and saltwater aquariums After something different? View all Water Care Supplies. New to fish care? View our guide to Setting Up a Fishtank.