Product review (2 stars): Very Ineffective at Dispersing Water
As indicated by several other reviewers, these humidifier filters quickly dry up, get clogged with scale (despite using soft water and anti-scale treatment), and become very ineffective at dispersing water into the air.  The filters dry up so much that it prevents the normal capillary action and water does not get saturated in the filter media thereby preventing the normal dissipation of water by the humidifier. I performed several informal tests over 6 weeks and went through three sets of pads.  During the first two days of using a new filter, the humidifier is able to disperse 4 gallons of water per day.  By middle of the week and until the filters get replaced, they barely disperse half a gallon of water each day.  I also noticed that the filters are larger than usual and make for a tight fit in the humidifier.  Because the media is "squeezed" in the humidifier, I suspect that prevents some air from passing through the filter media and perhaps leads to the premature hardening of the filter media.  I never had this issue with the OEM filters.