LTWHOME Replacement Bio-Foam Filter Pads Fit for Marineland C-160 & C-220 Canister Filter (Pack of 6) Packing include: 12 pcs poly filter pads. Change every 3-4 weeks. Custom designed and manufactured for Marineland C-160 & C-220 Canister Filter. Provides efficient water flow with less clogging for long lasting filtration. Enhances biological filtration.