Bio3 Penguin Filter Cartridges Penguin 170, 200, 330, and 350

3-stage filtration in a single cartridge Baffle floss bag prevents carbon from settling Clamshell frame locks securely to contain media Disposable, baffle floss/carbon bag provides mechanical and chemical filtration and prevents carbon from settling. Also includes one reusable aerobic sponge for superior biological filtration and one clamshell frame for easy slide-in installation in Penguin filters. Fits Penguin 125 and 150, Regent Aquatech 10-20, Neptune 20, and Penguin 170, 200, 330, and 350.Please click on "More Information" for installation instructions.