Emperor Filter Systems are advanced aquarium technology at its finest. Flow and filtration efficiencies unmatched by other filters in their class; as much as twice the filter cartridge capacity; additional chemical filtration capability; extra effective, spray bar-driv BIO-Wheel wet/dry biological filtration...that's 3-stage Emperor filtration. The Emperors feature not one pump (as in ordinary power filters), but two separate water pumps. The Flow Pump directs water through the high-capacity Emperor Rite-Size Filter Cartridges and Media Containers. The BIO-Pump then pressurizes and sends streams of prefiltered, oxygen-rich water through the adjustable spray bars to power each BIO-Wheel. Every preassembled Rite-Size Cartridge now comes in new color-coded packaging. It's the fast, easy, foolproof way to choose the right cartridge for your Penguin Power Filter! ADDITIONAL PERFORMANCE FEATURES Heavy Duty Emperor Rite-Size Filter Cartridges. Trap more dirt and debris as they remove harmful contaminants...superior, faster-acting Black Diamond carbon filtration and 45% more mechanical filter area! Refillable Media Containers Hold additional amounts of activated carbon or other chemical filtration media to maximize pollution removal capacity. Extra Large Spray Bar-Driven BIO-Wheels Deliver classic wet/dry biological filtration capacity to any system...large or small. Worry-Free, Epoxy-Sealed Motor U/L listed, CSA available...and moisture-proof to ensure safe operation. Indicator Windows and Two-Way Hinged Cover Provide easy system access and servicing convenience. Emperor 400 For aquariums up to 80 gallons Two Rite-Size "E" Filter Cartridges Two 4-oz Refillable Media Containers Two Spray Bar Driven BIO-Wheels Certified Flow : 400 GPH INFO FROM UNITED PET GROUP