Product review (4 stars): These filters are perfect!
These filters worked great in our humidifier.  The only thing that I don't like is that I would like them to last a little longer.  It would be nice if you only had to buy filters every 4-6 months but I guess that is a bit much to ask for.  I can deal with changing them every month.  I just use plain tap water and they last just as long as the ones that came with the humidifier.