Aqueon Replacement Filter Cartridges Medium 1-Pack

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.