The Aqueon Small Bow Filter Cartridge Replacement is a dual-sided dense-floss filter cartridge for your Aqueon desktop aquarium. It installs in seconds and fits the Mini Bow 1, Mini Bow 2.5 and Mini Bow 5 models. This unique cartridge contains over 25% more activated carbon than most comparable cartridges and ensures even carbon distribution for thorough filtration. Your tank will stay cleaner longer as particles, debris, impurities and odors are filtered out.