Fits Aqueon QuietFlow Filter: LED PRO Size 10 and E Internal 20 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.