The device makes at first sight a very stable and powerful impression. Quickly installed and intuitive to use, I was able to make the first two chimney cleanings with acceptable volume easily. During the third cleaning the vacuum cleaner went out of the suction force. Of course, I immediately thought of the filter. But beware, because the suction was no longer present, some remained on dust in the pipe, so only open outside. In bucket hardly the floor was covered with ashes. So withdrawn the filter and 5 min. tapped. The filter also looked fairly clean and was thus reinstalled. Nevertheless, the suction hardly improved. When I count the time that I always need to clean filters (and then the power does not even improve), I can use the fireplace again clean by hand.
