Enjoy drama-free filter changes with this easy-change filter cartridge for your CF Mini Internal Cartridge filter. This service pack has everything you need for 3 months of crystal clear water. It contains 3 x high quality filter cartridges to keep your filter working hard clearing and purifying water in your aquarium. The cartridges include Algaway spheres to help keep algae at a minimum for a beautifully clear aquarium. Replace your filter cartridge every month for a healthy, clean and algae-free aquarium.