Product review (2 stars): $ savings up front, but costly in other ways.
Though the filter works, it seems it does not humidify the house as well as the one that came with the humidifier.  The humidifier runs much more frequently but doesn't increase the humidity as much as the last one.  Personally, I don't think this are worth the $ savings due to the fact that you are wasting energy, which costs $. These filters also do not last as long as the one that came with the humidifier.  Note that I use bacteriastat every time I refill. With all this in mind, the savings on the cost of the filter ends up costing me in other ways...  I will not be purchasing these again.