These are genuine carbon impregnated foam pads for the fluval fx4, fx5 and fx6 external filters. fluval carbon impregnated foam pads are specially designed for fluval fx4/fx5/6 high performance canister filters. These carbon impregnated pads capture micro particles as the water passes through. The added carbon removes odour, discolouration, as well as heavy metals and organic contaminants.
