Fluval Poly-Max filter 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 Fluval's U-Series Underwater Filter. Contains 2 cartridges.-Filter cartridge helps control green water and unsightly algae growth by adsorbing and trapping phosphate, nitrite and nitrate-Effectively produces crystal clear water, reduces odors, and creates ideal conditions for fish and plants-Helps reduce overall aquarium maintenance-Ideal for freshwater and marine environments-Designed for Fluval's U-Series Underwater Filter-Contains 2 cartridges
