AquaClear 110 Foam Filter Insert is replacement filter media for the AquaClear 110 Power Filter. The AquaClear 110 Foam Filter Insert is a mechanical filter media that effectively removes particles and debris from aquarium water. It also prevents particulate waste from prematurely clogging other media in the filter. Primarily a mechanical filtration media, it also provides powerful biological filtration as friendly bacteria eventually grow inside its pore structure. Exclusively designed for the AquaClear 110 Power Filter, the Foam Inserts are safe for fresh and saltwater aquariums.