Product review (2 stars): Still on my first filter, but getting the humidity ...
Still on my first filter, but getting the humidity above 35% is taking days.  Prior filters kept humidity at 45% on low or medium fan speed whereas high speed is hardly raising humidity with this filter.  We have had below freezing temps using both filters.  I tried reversing the filter, but that doesn't seem to help either. This filter has been used less than 2 weeks; the old filter lasted two months before it became ineffective.