Aquatop Replacement Filter Sponge for CF400-UV, 1 Piece - Coarse/BlueKeep your Aquatop CF 400UV MKII Canister Filter performing at its best with this genuine replacement coarse filter sponge. The blue coarse sponge serves as the first line of defense in mechanical filtration, trapping large debris before it reaches finer media. Regular replacement ensures consistent flow and long filter life. Compatible with: Aquatop CF 400UV MKII Canister Filter Quantity: 1 piece Type: Coarse Blue Function: Pre filtration captures