REPLACEMENT FILTER CARTRIDGE: Pack of 6 fits Marineland Penguin PRO Power Filters 275 and 375; also fits original Penguin Power Filters 200 and 350.
EASY TO INSTALL: Pre-assembled cartridges slide easily into place, providing mechanical and chemical filtration and making replacement fast, dry and effortless.
Chemically filtered through Black Diamond Premium Activated Carbon.
BIO-Wheel technology delivers wet/dry biological filtration for nitrifying bacteria growth.