Marineland Penguin 150 GPH Power Filter / Cartridge Bundle Marineland Penguin 150 GPH Power Filter and a 3 Pack of Extra Cartridges Certified flow rate of 150GPH, perfect for all aquariums up to 30-gallon, uses the Rite-Size B" filter cartridge" Delivers easy, three stage mechanical, chemical, and biological aquarium filtration Convenient Penguin Rite Size Cartridges come ready to use with each filter 3 Pack of Extra Cartridges Included