Fluval U4 Underwater Filter Foam Pad Specifically designed for the Fluval U4 filter, the U4 Bio-Foam Pad captures large particles and debris for effective mechanical filtration. Features Mechanical filter media. Fits perfectly inside the filter chamber to prevent debris from escaping. Ideal pore size allows efficient water flow, less clogging and long-lasting filtration. Suitable for freshwater, saltwater or reptile environments. Convenient 2-pack format. 2 x foam pads included.
