Filter blocks lasting odors.

Our three year old Miele vacuum cleaner "muffelte" while vacuuming always something. On anther it was not. Then I realized that this filter had been changed only once (you can then enter the exchange date). Time goes by faster than you think. With the new filter odors were again totally gone. For household use should change this "Activ Air Clean Filter" probably once a year, so he can stop odors. While not exactly cheap, but who wants the fug vacuuming? Conclusion: 5 points for the smell stop!