Specifically designed for the Fluval U4 filter, the U4 Bio-Foam Pad captures large particles and debris for effective mechanical filtration.

  • 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