Product review (2 stars): Made in China Crap!
I bought these filters because Lowe's Home Improvement no longer carries the filters for the humidifier we bought there.  I used to buy one manufacturers filter and it would last the entire heating season.  I put the first filter in at the end of October, and I just put the last one in, and it's only January 19th.  There is no reinforcement in the filters, so when they are wet, they collapse.  The humidifier shuts down and tells me I need to replace the filter, after only a month or so of use.  They don't fit properly either, as they are not long enough to fit entirely around the appliance.  I thought it was a great deal and I was saving money, but I may as well have bought the more expensive one.