Penn Plax Cascade 700/1000 GPH Floss Pads, 24 Pads Total (4 Packs with 6 pads in each pack) 24 Pads Total (4 Packs with 6 pads in each pack) Convenient, no-fuss replacement pads for your Cascade canister filter Traps particular matter keeping your aquarium clean & clear Helps extend the life of your carbon and biological filters