AquaClear 70 Foam Filter Insert provides mechanical filtration by trapping particles and debris, In addition the AquaClear 70 Foam Filter Insert offers powerful biological filtration, and is designed to fit the AquaClear 70 Power Filter, AquaClear 70 Foam Filter Insert Features and Benefits:, - Freshwater and marine aquariums, - Optimal pore size for efficient mechanical and biological filtration, - Tailored fit prevents bypass, SKU: RCHG0443