Adjustable 132gph Filter Flow Rate with Surface Skimmer to eliminate undesired surface films Features a 5W UV Sterilizer. Helps eliminate algae and bacteria, keeping aquarium water crystal clear Suitable Aquarium Tank Size: 10 to 30 Gallons Dimension: 7.6 x 4.4 x 6.5in (192 x 110.5 x 165mm) Biological and mechanical filtration. Box includes active carbon and bio media The Grech CBG-Series Hang-On Back UV Filter comes with a diverse and unique design. While being suitable for freshwater and saltwater aquariums, its style is a “Hang-On Back,” making it convenient for daily use. The filter is beautifully crafted to allow a simple installation and quiet operation. Water flow can be control accord to your aquarium needs. The CBG-Series has a biological and mechanical filtration and comes with active carbon and bio media. The CBG-Series also features a 5W UV Sterilizer which can be turned on and off. The UV Sterilizer helps in eliminating algae, keeping aquarium water clear, and aids in the health of aquatic animals from free-floating parasites. The controllable surface skimmer can reduce surface oil from your aquarium tank.