The EHEIM Professionel 4+ External Filter is a high-quality canister filter designed for reliable and efficient aquarium filtration. It features strong water flow, large media capacity, and quiet operation to support stable biological, mechanical, and chemical filtration. The built-in flow bypass function allows extended use between cleanings, and the easy-access design makes maintenance straightforward. Ideal for freshwater or marine aquariums, it offers dependable performance for long-term, healthy water conditions.