Fluval CLEARMAX is a science grade resin designed to adsorb phosphate, nitrite and nitrate.  Removal of these compounds results in crystal clear water, less odours and it reduces the maintenance of your aquarium creating ideal condidtions for fish.      Traps phosphate, nitrite and nitrate     Creates crystal clear water, ideal conditions for fish and plants     For fresh and saltwater aquariums     Treats 300 L (80 U.S. gal.)   For filter models: 106, 206, 306, 406, FX5, 105, 205, 305, 405, 104, 204, 304, 404.