Product review (1 stars): I followed instructions like they say to let the filter sit in water ...
JUNK!!!!!!! Got these humidifiers last year and the filters worked and did not have that white powder anywhere. Now I see that Air-O-Swiss sold out to Boneco and I have this white powder everywhere. I followed instructions like they say to let the filter sit in water for 24 hours, so someone from the company cannot say I did anything wrong.

The white powder got so bad it was clogging up my furnace filter caking it with it since I have 2 of these humidifiers. I do not know what they changed or why these filters do nothing and now have to use distilled water where last year they were fine.

I even went as far as getting 2 new filters when this first happened thinking I got some defective ones. I did email the company and never even got a response from them, so I would say customer service is not that good either.

I will not go through this next winter and will look for new humidifiers and defiantly will not purchase any of this brand. They sell 2 filters and one is this and one goes in the water tank they claim stops this, but it does not and it a complete waste of money.