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.

Features:

• 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
• Rinse before use