CNZ HW-3000 Canister Filter Series delivers crystal-clear aquarium water. These multistage filtration systems also include a self-prime button, so your canister filter begins cycling with just one pump. The HW-3000 handles up to 793 Gallons per Hour (GPH) and has an optional surface skimmer to remove oils and waste from the surface of your aquarium water. This CNZ HW-3000 canister filter comes equipped with 9w sterilizer and all the necessary plumbing for installation. How Does the HW-3000 Canister Filter Work? Unfiltered aquarium water enters the CNZ HW-3000 Canister Filter and passes by the sterilizer flowing down the stack of vertical cylinder cutouts to the bottom of the Filter. Then water is pushed up through the filtration media compartments; the bottom compartment first, the middle compartment second, and the top compartment third. The filtered aquarium water then returns from the canister back into the aquarium. Features: 5-Stage Filtration System Built-in 9-Watt sterilizer Self Priming Pump Includes Secure-mount Fittings Includes Optional Surface Skimmer Capable of Mechanical, Biological, Sterilizer Filtration Suitable for Tanks up to 175 gal