Outdoor Cat Playhouse : Cascade® Filter Replacement Cartridges ...
Cascade® Filter Replacement Cartridges for Cascade® 80 Hang-On Power Filters, 3-pack Overviews Cascade® filter replacement cartridges from Penn-Plax® work to keep your aquarium water clean & clear. Each pack contains 3 disposable filters specially designed to fit your Cascade® 80 hang-on power filter. Each easy-to-replace disposable cartridge is perfectly sized to fit your Cascade® 80 hang-on power filter.