Fluval U Clean & Clear Cartridge

From the Fluval range. For use with the u filter series: U1 U2 U3 U4. Packed with special high-performance resins, proven to reduce phosphate & nitrate for a cleaner, clearer aquarium & healthier fish. Add to the central fluval u cartridge alongside the biomax. Helps extend the time required between water changes. 2 pieces per pack.