Specifically designed for the Fluval U3 filter, the U3 Poly-Max Cartridge helps control green water and unsightly algae growth by trapping and adsorbing phosphate, nitrite and nitrate.

 

  • Chemical filter media
  • Produces crystal clear water, reduces odor, and creates ideal conditions for fish and plants
  • Helps reduce overall aquarium maintenance
  • Suitable for freshwater, saltwater or reptile environments
  • Convenient 2-pack format