Product review (4 stars): Getting your moneys worth
The filters do what they are suppose to. They are grossly over priced for what you get but you are damned if you do and damned if you don't so why not get your moneys worth from them. When it's time to replace the filter, reverse the ends (bottom end up and top end down). The filter doesn't  know the different.
DO NOT FORGET TO RESET YOUR HUMIDIFIER.