Product review (5 stars): Outstanding Wicking Filter
This replacement wicking is outstanding.  It holds plenty of water.  I turn it over once a day to extend its life.  I am able to use it for 45 to 52 days before the mineral content of our water hardens it too much.  We have very hard water.  I am very pleased with this filter.

I am updating my original review.  Today is Sep 19, 2017.  I purchased two generic (not Honeywell) filters.  They managed to add about 2 gallons of water to our home atmosphere in a 24 hour period.  The Honeywell filters add 6 gallons of water to our home atmosphere in the same period of time.  I have our controls on the humidifier at their highest settings.  We live in a very arid climate, so we greatly appreciate the increased humidity.  I will not purchase any other brand of filter after this experience.

Honeywell doesn't produce the filter with a blue prefilter any longer.  It's not necessary.  But, I wanted to reassure everyone that it's not a bait and switch situation.

I'll hope that this is helpful.