Product review (3 stars): Works good, but . . .
I have been using this product for about 3 weeks now. When I first started up my humidifier for the season there was still a little bacteria odor even after cleaning. I added this product and after 3 or 4 days there is almost no detectable bacteria odor.

I would give this product 5 stars, except that I haven't been using it long enough to be sure. And there may be a problem with it foaming, and causing some problems with my humidifier.

I'll try to remember to update this review.

Update 2-13-13
It does foam too much in my humidifier. This causes an annoying snapping sound in the humidifier. Like the bubbles bursting, except louder and sharper. Nothing terrible, but I have to run the humidifier on low to stop it from making that annoying noise. Can't run it on high anymore. The sound is more like mild electrical arching, and I wonder if the foam is getting into the electrical controls at the top of the unit.