The first water filtration medium to be made of natural and synthetic ion-exchange resins that selectively remove ammonia, nitrites and nitrates in freshwater aquariums. Helps establish new aquariums by controlling the levels of ammonia, nitrite and nitrate. Also for use in established aquariums whenever ammonia or nitrite is detected. * May be recharged for extended use. * Can be used with activated carbon. * Use in freshwater aquarium. Treats up to 208L. 1 Large Pouch.