Product DescriptionThe AquaClear Power Filter represents one of the most versatile hang-on filter systems available. The five models available provide a complete selection of flow rates for the most popular sizes of aquariums. The filter?s unique design allows for up to six times more media volume and the longest water to media contact time in the industry. The AquaClear 50 Power Filter features a unique multi-stage filtration system that provides complete mechanical, chemical, as well as biological filter media for superior water quality. The Power Filter has a filtration volume that is up to 7 times larger than comparable filters. It also allows superior contact time with AquaClear filter media. The filter preserves beneficial bacterial creating a stress-free environment for fish aquarium inhabitants (freshwater fish and live aquarium plants) and maintaining clear aquarium water. Its unique waterfall design enables filtered water to return to the tank silently, gently breaking the surface tension and creating beneficial oxygenation. The Power Filter?s patented flow control feature allows you to adjust the water flow according to your aquarium needs. The media basket prevents water from bypassing the filter media, maximizing filtration efficiency. Installation and maintenance are quick, easy, and convenient. The filter comes equipped with AquaClear Foam, Activated Carbon Filter and AquaClear BioMax. AquaClear offers an extensive line of media, including Zeo-Carb and Ammonia Remover, exclusively designed for the AquaClear 50 Power Filter. AquaClear creates a wide variety of products for freshwater tanks that can be used as fish tank accessories, fish tank decorations, and aquarium filter media that is perfect for large and small fish tanks. The AquaClear 50 Power Filter is ideal for 20- to 50-gallon (76 to 190 L) fish tanks. Maximum Output: 200 U.S. Gal./h (757 L/h).Amazon.comAquaClear Power FilterThe AquaClear Power Filter represents one of the most versatile hang-on filter systems available. The five models available provide a complete selection of flow rates for the most popular sizes of aquariums. The filter?s unique design allows for up to six times more media volume and the longest water to media contact time in the industry.Superior Contact with AquaClear FilterPatented Re-filtration System Sometimes delicate fish and plants require a more gentle water flow. The patented AquaClear re-filtration system allows you to control the flow rate without compromising filtration efficiency. When the flow rate is reduced, up to 50% of the water within the filter chamber is processed multiple times.CycleGuard Multi-Stage Filtration SystemProvides optimal mechanical, chemical, and biological filtration. A healthy aquarium requires "beneficial" bacteria. Invisible and harmless, beneficial bacteria are essential in the removal of toxic ammonia and nitrite. With cartridge filtration systems, when you throw away the cartridge, you throw away beneficial bacteria. It can take weeks for the bacteria to re-colonize, resulting in a stressful environment.Typical Filter Media Placement:BottomAquaClear Foam Insert, which does the following: 1. Helps with debris removal and provides optimal water distribution patterns, allowing subsequent filter media to perform at full efficiency. 2. Biological filtration, due to the porous structure of foam, providing surfaces for beneficial bacteria.MiddleAquaClear Activated Carbon Filter Inserts contain 100% premium research grade carbon. Premium research grade carbon provides large amounts of surface area for adsorption of undesirable impurities.TopAquaClear BioMax Filter Inserts contain BioMax ceramic rings. The surface of BioMax is made up of a complex pore system that allows bacteria to thrive.AquaClear Power FiltersPower Filter MaintenanceFor maximum filter operation and efficiency, regular cleaning of the filter and its parts is recommended every two weeks.A