The Marineland Magnum 350 is the only filter of its kind with a self-priming, bottom-mounted motor. The Magnum Canister Filter provides the ultimate in easy set up and restart capability. Total water filtration with no by-pass. All Magnums convert from continuous duty to water polishing. There is nothing to oil and no bearings to wear out. The Magnum 350 is a powerful water polishing and filtration unit complete with a micron cartridge. Filters 350 gallons per hour.