Product review (5 stars): Got a humidifier? This is a product you CANNOT be without!
We've been using a humidifier for the past few years, and it's worked great. The thing that bothered me, though, was battling the growth of mold. No matter what you do, if you're constantly feeding it water that stands for weeks at a time, you're going to eventually have a mold problem. The one thing  you do NOT want is a humidifier spraying contaminated water around your dwelling!

I never knew there was a solution that combatted the problem, but the minute I found it I was on that bandwagon. It's inexpensive, and it solves the mold problem STAT. It should be packaged with humidifiers, IMHO; no one who regularly uses one should be without this product.