AquaClear 50 Foam Filter Inserts, Aquarium Filter Replacement Media, 3 Count (Pack of 1), A1394

Foam traps particles and debris for mechanical filtration; tailored fit prevents bypass, Provides biological filtration as friendly bacteria grow inside pore structure, Replacement media designed to fit the AquaClear 50 filter, Suitable for both freshwater and saltwater aquariums up to 50 gallons, Includes three AquaClear 50 Foam Filter Inserts