Fluval FX4/FX5/FX6 Filter Series Foam Pads 3-packTraps large dirt particles and debris for effective mechanical filtration Secures the important first filtering phase Exact fit to prevent bypassing Efficient water flow Low maintenance Suitable for freshwater and saltwater aquariums 3 filter cartridges per pack FX Series Foam Pads are specially designed for FX4, FX5 and FX6 high performance canister filters. The pads capture large particles and debris for effective mechanical filtration, the crucial