Aqueon Replacement Filter Cartridges Large (6 Pack)

Aqueon Replacement Filter Cartridges Large (6 Pack) Fits Aqueon QuietFlow Filter: LED PRO Size 20 & up and E Internal 40 gallon | Ready-to-use cartridge contains high quality activated carbon that keeps water clean, rinse before replacing | Installs in seconds: align cartridge bottom key slot for an accurate fit inside the Filter | For optimal performance, change approximately every 4 to 6 weeks | Do not clean Bioholster when replacing the cartridge as it contains beneficial biological bacteria Patented dual-sided dense-floss cartridges contain over 25% more activated carbon than the leading brands. These unique cartridges were designed to ensure even distribution of carbon throughout for more thorough filtration and longer cartridge life.