Penn-Plax Cascade Bio-Floss Replacement Poly Fiber Floss Pads for Cascade 500 Canister Aquarium Filters – 6 Pack, White
The Penn-Plax Cascade Bio-Floss replacement poly fiber floss pads deliver effective mechanical filtration for your Cascade 500 canister filter, trapping fine debris before it clouds your water. Designed for a precise, gap-free fit, this 6-pack gives you a full year of scheduled maintenance at a great value. Replace pads every four to six weeks for consistently clear, healthy aquarium water. Available on Amazon.