Aqueon Replacement Filter Cartridge 9 pack

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. Fits Aqueon QuietFlow Filter: LED PRO Size 20 and up and E Internal 40 gallon Ready-to-use cartridge contains high quality activated carbon that keeps water clean 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