I bought the device because of the overwhelmingly positive recessions and since I sleep desirable me a fresh ionized air breezes at night with closed windows. It does this too, but only as long as you clean it every week, and it operates with an open window. Otherwise spreads in the room that is quickly a sharp smell of ozone combined with the smell of what one knows from full vacuum cleaner bags. In addition, the unit produces quite annoying "hiss". So I can really recommend it only for the hours in between have application because whirled dust particles in the immediate vicinity seem to be actually committed.
