Marineland Bio-Wheel Penguin Aquarium Power Filter, 75-gal & Marineland Bio-Wheel Penguin Rite-Size C Filter Cartridge, 6 count; Keep your aquatic amigos living the best life. Each purchase comes with the Marineland Bio-Wheel Penguin Aquarium Power Filter, 75-gal & Marineland Bio-Wheel Penguin Rite-Size C Filter Cartridges, 6 count. The filter helps keep your aquarium crystal clear and offers complete three-stage filtration for both freshwater and saltwater tanks. An extra-large BIO-Wheel rotates to cultivate the beneficial bacteria that remove toxic ammonia and nitrates from the water. It features noise-reducing vented covers and adjustable intake strainers. The cartridges mechanically filter water through a pad of double thick poly-fiber, trapping debris and waste particles before the water is chemically filtered through Black Diamond Premium Activated Carbon. They are made with a unique ribbed backing to ensure even distribution of activated carbon—and maximum water-to-carbon contact—for crystal clear and clean water.