REPLACEMENT FILTER CARTRIDGE: Pack of 4 ct.  cartridges fits Marineland Emperor PRO Power Filter 450; also fits original Emperor Power Filters 280 and 400.
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.