Cascade Canister Filter Bio-Sponge

Penn Plax Cascade Canister Filter Bio-Floss replacement pads help trap floating particle matter, keeping your aquarium water crystal clear. Replacement is simple and convenient to keep your filter cleaning.
Poly fiber floss pad traps floating particulate matter
Convenient, no fuss replacement floss pads
Fits Cascade Canister Filters
Specifications: Replacement pads for Cascade 1200 & 1500 Canister Filters only. Replacement pads for other models are also available.