(2 Boxes) Aqueon 06087 Filter Cartridge, Large, 3-Pack each. Ready-to-use, preassembled filter cartridges install in seconds and help create crystal-clear, healthy water for your aquarium.Patented dual-sided replaceable dense-floss cartridges filter out more particles and debrisCartridges contain more activated carbon to remove toxic impurities, odors and discolorationFor use with fresh or saltwater aquariumsReplacement cartridges for Aqueon Power Filters 20, 30, 55 & 75For best results replace cartridge every 4-6 weeksOffered in a variety of sizes