Product review (5 stars): Much higher quality than the stock filter that came with my unit
For those who only have experience with filter that comes "free" with the ReliOn's I was expecting pretty much the same thing -- a filter that after about a week you tried as hard as you could to not touch or move it as the whole thing just disintegrates in short order.

So I ordered like four boxes, each containing 2 filters.  The first of these replacement filters has been in my humidifier that runs about 18 hours a day for over a month -- they are still strong, all in one piece, and I can wash them, extending their life.  You can tell the difference in them, they are much heavier the the filter that comes with the original humidifier.

Stock up, good value.