I have AEG Öko_Favorit 80800 and it had a blockage in the dirty water output hose, a piece of small bone under the kitchen sink. It was small enough to flow trough the nylon filter which had broken some months earlier, and I had no good reason to replace it. Well now I have. As a surprise the new filter was made of metal, so the factory has already found that it will not stand.
Timo Repo, June 2006