The Air O Swiss was also an ultrasonic. But I didn't notice too much white powder anywhere. But it could be that we still have carpet in the bedroom so I didn't see the powder? The other big ugly one I have works, but the lowest setting is still very loud and I can't sleep to that. The AOS was virtually silent.
I'm still waiting to hear back from the BBB.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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