The FORZA 36-Gal Power Filter is an easy-to-use, dual 3 stage hang on filter that features mechanical, chemical & biological filtration. This Power Filter comes equipped with all the necessary filter media to ensure superior filtration. The PFE-6 hang-on-back filter utilizes a filtration chamber system with two replaceable filter cartridges enhanced with Aquatop?s premium Activated Carbon and dual Bio-cartridges. The Bio-cartridges have a maximum surface-area for your beneficial bacteria to colonize, removing harmful ammonia. This model includes a built-in surface skimmer. Easy-to-use, dual 3 stage hang on back filter. Features mechanical, chemical & biological filtration. Comes equipped with all the necessary filter media to ensure superior filtration. utilizes a filtration chamber system with two replaceable filter cartridges enhanced with Aquatop?s premium Activated Carbon and dual Bio-cartridges. Bio-cartridges have a maximum surface-area for your beneficial bacteria to colonize, removing harmful ammonia. Includes a built-in surface skimmer.