Product review (3 stars): Don't last like the originals.
When first installed my humidifier emptied it's tank in less than 24 hours, great.  By week 4 it was taking over 2 days and at week 6 it has ran for 3 days and still has a third of a tank of water in it.  The filter was hard and dry except for the inch of it in the water and several inches up, it broke apart when removed.  The original filters would also lime up but they definitely lasted longer.  They are priced to sell but buy a multi pack to get you through the winter.