Product review (5 stars): Great way to protect your humidifier and keep unwanted growth away!
We had one humidifier in our our master bedroom and just purchased a new one (http://www.amazon.com/gp/product/B00YFFRDV0?psc=1&redirect=true&ref_=oh_aui_detailpage_o08_s01) for our living room.  We have been using this add in for about a year and it has helped keep the Algae and grime from growing over weeks of use.  We put about 2 shot glasses it the water reservoir about every 8-10 gallons and it works great.

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