Marineland Emperor 400 GPH Power Filter / Cartridge Bundle Marineland Emperor 400 GPH Power Filter Plus a 4-Pack of Refill Cartridges Certified flow rate of 400GPH, perfect for all aquariums up to 80-gallon, uses two Rite-Size E" filter cartridges" Revolutionary two-pump design for unmatchable flow and filtration Features twice the filter cartridge capacity