Product review (4 stars): So far, so good
I am happy with the filter that fits my Kaz humidifier which is more than several years old.  It is a little different from the ones i used to buy from the manufacturer, but it looks like it will be effective.  Instead of being a long  rectangle that fits in-between the supports in the base of the humidifier, this one is continuous, with some stretch in the fibers to allow you to fit it through the supports.  I just hope that it does not get too frayed taking it out and putting it back when I clean the humidifier weekly during the winter months when I use it.  One less star because i have not used it yet.