Designed for use with the Aqua Clear 150 Aquarium Power Filter. Also for Aqua Clear Junior. Amrid Ammonia Remover removes harmful ammonia, reduces ammonia stress for fish, lowers ammonia concentration in new aquariums, and supports beneficial bacterial colonies. CycleGuard protection is achieved by combining multiple inserts with the largest media volume available. Alternate replacement of Aqua Clear inserts retains sufficient bacterial populations to rapidly reseed the biological filter after cleaning. Continuous breakdown of harmful toxins, in addition to superb solid and liquid waste removal, adds up to the best filtration for the aquarium inhabitants. Amrid chemically bonds with ammonia to remove it from fresh water aquariums. New aquariums do not have bacterial populations sufficient to remove ammonia concentrations. Excess levels of ammonia can be created by natural life processes, overfeeding, dead or decaying organic material, or from breaking the chloramine bond in municipal water supplies when treating aquarium water. Amrid absorbs free ammonia to make your aquarium a safer place for aquatic life.