Product review (5 stars): Doubled our wick life.  And maybe more? Yet to be seen.
I'm testing to determine if the wicks last longer. - I've used this for 120 days now.  So far it appears the life of the wick is doubled, at least with our water type and usage.  I use it in one of three humidifiers running 2 to 3 gallon water per day.  I've changed the other two wicks while this humidifier is still going strong.  The cost of this product is more than covered with the extended life of the wick.  The test continues:

I tried using it with a wick that was lightly plugged with hard water chemicals, one week into the test.  So far it appears to have rejuvenated the wick.  Fingers crossed.????