Product review (2 stars): Stuck buying these over and over
This filter is pretty pricey compared to others and I have yet to get more than one season out of it.  I only use my humidifier during the winter and I will be looking to get a replacement next fall.  There does not appear to be a way to clean it.  The first few weeks the thing works great then the absorbancy appears to taper off as time goes on.