12 x Compatible Foam and 12 x Polymax Filter Cartridges and 3 x 170g Biomax for Fluval U4
The polymax / clearmax filter cartridge helps reduce overall aquarium maintenance and filter phosphate, nitrate and nitrite. These cartridges should be replaced approximately every 4 weeks, each pack contains 4 cartridges and 4 plain foams and 1 x 170g compatible biomax media. Sold in 3 different sizes for the U2, U3 and U4 filters.
Compatible Fluval U4 PolyMax Filter Cartridges Phosphate Nitrate Foam Fish Tank Aquarium Filter
You are purchasing Finest Filters Compatible PolyMax / ClearMax filter cartridges and plain foams suitable for the Fluval U4 aquarium filter.
Replacement PolyMax compatible filter cartridges for Fluvals U4 series of internal filters. These help control green water and unsightly algae growth by adsorbing and trapping phosphate, nitrite and nitrate. It effectively produces crystal clear water, reduces odours, and creates ideal conditions for fish and plants. The polymax / clearmax filter cartridge helps reduce overall aquarium maintenance. These cartridges should be replaced approximately every 4 weeks, each pack contains 12 cartridges and 12 foams and 3 x 170g compatible biomax media. Sold in 3 different sizes for the U2, U3 and U4 filters.