Product review (1 stars): Worst filter I've ever bought!!!
I bought one of these at Target and it is SO HORRIBLE I had to review it.  This is the most cheaply made piece of junk I have ever seen.  Out of the box I thought it was used because there was brown dirt/dust pile looking spots on the black mesh.  I almost returned it, but the white paper disnt look used.  I was very confused until I realized the black mesh was not plastic on this particular filter, it is cheap thin cardboard.  This explained the brown dirt/dust markings, it was a terrible paint job that wasn't completely coating the cardboard.

After 3 weeks of use, keeping my humidifier nearly constantly filled with water, I hazve yet to get the humidity in my air above 21%.  My humidifier has a digital readout on it.  The last filter I used was a Sunbeam brand one and under similar running conditions I was consistently getting readings in the mid 40%.

I will never waste my $ on any Holmes filters again!!!