Aqueon 06419 Filter Cartridge, Large, 12-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 & 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