Product review (1 stars): Last year, I used the original Honeywell filter that ...
Last year, I used the original Honeywell filter that arrived with the Quiet Air machine, and even though it was only on at night in our bedroom, it worked really well all winter.  I threw it out at the end of the season, even though it only had a few brown spots (big mistake, should have cleaned it).  Then went to buy another for this winter and thought the prices for the original were way too high, so bought 3 Crucial Air filters instead.  Within 3 nights, the first filter developed a stale musty smell that stunk up the whole room.  I cleaned it, only to have it happen again the next night.  Tried another one, exact same issue.  So....I just purchased a new original Honeywell filters to put in now.  I still have one more Crucial Air filter, not sure what to do with it, but it isn't going into my humidifier.  Buyer beware.