The Aqueon Replacement Filter Cartridges are made with a patented dual-sided dense-floss contain over 25% more activated carbon than the leading brands. These unique cartridges were designed to ensure even distribution of carbon throughout the cartridge. This Large cartridge is for use with Aqueon QuietFlow 20, 30, 50, 55 & 75 Power Filters. To use, simply rinse under cold water and install.

Features:

• Large size, for the Aqueon QuietFlow 20, 30, 50, 55 & 75 Power Filters. This is also is for the Aqueon LED 20 High Starter Aquarium Kit Filter (an Aqueon QuietFlow 20 LED Pro Power Filter).
• 12-pack.
• 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 Bio Holster when replacing the cartridge as it contains beneficial biological bacteria