Product review (5 stars): We still change the filters once or twice over the winter because of dust/hair build up (we have a DLH cat and a cute little mut
We've used this stuff for over a year.  We still change the filters once or twice over the winter because of dust/hair build up (we have a DLH cat and a cute little mutt- both of whom shed like crazy!).  Prior to this, I cleaned the humidifier per manufacturer directions (maybe not quite as often as suggested) but the filters still quickly molded.  Not anymore.