Aquarium Pharmaceuticals Replacement Filter Cartridge for TAP WATER Filter The Aquarium Pharmaceuticals Tap Water Filter is specially formulated to help make deionised pond water which is essential for healthy growth of fresh water fish. It is easy to use and comes in a replacement cartridge which can be easily connected to the tap water filter for uninterrupted supply of fresh, deionised aquarium water. Features: Easy to use Removes impurities from tap water Filter resin changes color when it's time to replace cartridge Item Specifications: Purpose and Benefits: An easy-to-use, single-cartridge tap water filtration system that removes impurities from tap water, making perfect, deionized aquarium water. Filter resin changes color when it's time to replace cartridge. Used cartridge can be replaced without tools in minutes. Comes fully assembled and attaches to any faucet in seconds. Includes 4 oz. bottles of Electro-Right and pH Adjuster to treat the filtered water, faucet adapter and tubing. For freshwater, saltwater, African cichlid or community aquariums.