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This is the first power filter to combine high-end performance with multiple filtration options. Filter features 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 pre-filtered, oxygen-rich water through the adjustable spray bars to power each BIO-Wheel. Ready-to-use cartridges have more mechanical and carbon filtration than any other cartridge. Provides superior biological filtration. Filter cartridges sold separately.