Product review (2 stars): Quality was reduced to force us to buy more.
The original wicks were good and would survive a few baths in vinegar to remove the hard minerals that had collected. These filters did not survive one rinse in a vinegar and water mixture. After 4 hours the filters started falling apart around the edges, turning into a nasty filter soup. After 6 hours sitting in the bath I go to place them in a water bath to rinse out the vinegar, but the filters completely fell apart. The original filters lasted through these same baths so well I was able to use them for about three months. These filters will last about four weeks max. I regret buying a humidifier that needs wicks as we've now spent a couple hundred, and will have to spend over a hundred a year to keep it running.

The photo I attached shows our second set of these filters after three weeks of use. They have about a week left before I'll have to replace.