Fx4 Carbon Filter Pads Compatible with Fluval FX4 FX5 / FX6 Canister Filter,Replacement Carbon Impregnated Foam Pads Aquarium Filter Media Pack of 6Brand: Poweka Color: black Features: Fitment Replcement carbon impregnated foam filter pads are compatible with the Fluval FX4, FX5 and FX6 high performance canister filters Fuction These carbon impregnated pads capture micro particles as the water passes through. The added carbon removes odour, discoloration, as well as heavy metals and organic contaminants, giving crystal clear water in your aquarium Range of Application Carbon impregnated filter