Product review (5 stars): You can't go wrong
I can not buy these filters anywhere but here at Amazon.  I had several humidifiers that I replaced with new simply because I could not find filters in any local stores.  I went to Amazon and have been able to find replacement filters for all my humidifiers so now they are all back in business.  These filters are well made.  I buy two boxes at a time which give me a total of six filters.  My primary tower humidifier uses two at a time so I have enough for a whole winter season by buying two boxes.