Product review (1 stars): Pass on this filter, better yet ditch the cool mist evaporative humidifier all together
With this brand new filter the filter status gauge on the humidifier was at about half way, just above the mark to indicate it needs replacement.  The humidifier just didn't seem to be humidifying very well with this brand new filter.  Didn't even last 2 months with limited usage before the gauge went all the way down and it no longer humidifies.  The filter still looks new but it isn't wicking the water up at all.  The quality definitely isn't what it used to be, which is probably why this type of humidifier isn't very popular anymore.

I ditched this cool mist evaporative humidifier that I had been using for years and went with a Vicks warm mist humidifier model V750 that I bought at Target.  So far I'm liking the new humidifier allot, seems much more effective. Only downside is that the warm humidifiers require more maintenance with cleaning/descaling the heating element, and slightly higher energy usage.

If you don't want to deal with the cleaning maintenance, and aren't concerned about potential health effects of breathing everything that's in your water, including microorganisms growing in your humidifier water, then get an ultrasonic humidifier.

The cool mist evaporative type humidifiers that use these filters was more convenient because instead of cleaning you just replace the disposable filter, but it is cost prohibitive if I have to replace the filter every month, and even then the performance is poor.