=”The Eheim professionel 4 �s are some of the most advanced external filters on the market. They incorporate many features including the new Xtender function, which maintains constant water flow, even when the filter gets blocked. Available in 5 models, to”&” suit aquariums up to 600 litres, including 2 thermal filter versions which have integrated heaters.�Eheim Professionel 4 250T Thermo External Filter is suitable for aquariums 250 litres.
