Aqueon Large Filter Cartridge - 3 pk.

The Aqueon Power Filter cartridge eliminates mechanical and chemical debris in your aquarium. Easy-to-replace cartridge contains over 25% more activated carbon than similar filter cartridges. Large size cartidges fits Aqueon Filter models 20, 30, 50 and 55/75.

4-Step Cartridge Replacement:

1. Remove cover from filter.
2. Remove used cartridge from bio-holster by pushing down gently on the holster and pulling the tab on the filter cartridge upwards. Discard used filter cartridge. Bio-holster should not be removed or cleaned, as it contains living bacteria.
3. Rinse new cartridge under cold water to remove carbon dust. Insert new cartridge into bio-holster by aligning the key slot on the cartridge with key slot on biological grid.
4. Replace cover on filter. Note: Cover will not fit properly if filter cartridge is installed incorrectly. Cartridges should be replaced when water begins to enter the filter bypass and/or the cartridge becomes clogged. Cartridges should be changed every 4-6 weeks.