Specifically designed for the Fluval U2 filter, the U2 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