Fluval U2 Poly-Max Cartridge helps control green water and unsightly algae growth by adsorbing and trapping phosphate, nitrite and nitrate.

It effectively produces crystal clear water, reduces odors, and creates ideal conditions for fish and plants.

The filter cartridge helps reduce overall aquarium maintenance. It is ideal for freshwater and marine environments and designed for the Fluval U2 Underwater Filter.

Contains 2 cartridges.