The new Eheim professionel 5e is the best external filter from Eheim. This powerful external filter offering everything an aquarium enthusiast could wish for. Each function can be individually programmed and controlled wirelessly. The electronic system monitors all functions and keeps the flow constant as well as delivering strong performance due to the large filter volume. The clever design and the regulation of the electronic flow extend the maintenance intervals for the biological filter material considerably and, in addition, there is the acclaimed smooth Eheim performance. The skilled workmanship, the high quality materials and the renowned Made in Germany reliability, combined with the 3 year warranty, leave nothing to be desired.With emergency button Xtender. This button makes it possible to have a little more time until the next cleaning of the external filter is carried out. Who of us aquarists isnt familiar with this problem? Always when we have the least time the water thr