Product review (4 stars): My humidifier has a blue area which shows the filter is good and working properly
I started using the filter a week and a half ago.  My humidifier has a blue area which shows the filter is good and working properly.  It also has a
red area which shows the filter is no longer working.  The first few days I could not get it into the blue area, it stayed in the tiny area between the
blue and the red.  For health reasons I have to have a working humidifier.  I started to return the good one, but I decided to give it a few more
days. It is now doing what it should.  My filters normally last for a month in a half, so I am yet determining whether the filter meets my requirements.