Marineland Penguin Power Filter w/ Multi-Stage Filtration Certified flow rate of 100GPH, perfect for all aquariums up to 20-gallon, uses the Rite-Size A" filter cartridge" Delivers easy, three stage mechanical, chemical, and biological aquarium filtration Convenient Penguin Rite Size Cartridges come ready to use with each filter Please refer the Product Manual, Set up Manual and the Instructional Video before use.