Marineland 12-Pack Rite Eclipse 6-Level Water Filter Cartridge, Size K

Preassembled Eclipse Filter Cartridges provide superior mechanical and chemical filtration, screening out dirt as they remove discoloration, odor-causing waste and harmful contaminants. Each disposable cartridge is packed with Black Diamond Premium Activated Carbon, the highest grade there is. Just shake, rinse and install. Horizontal cartridge design and patented ribbed back ensures even distribution and 100% water-to-carbon contact--no bypass. For best results, change monthly. Value Pack contains 4 3-Packs.