Product review (4 stars): User error, but saved it
So I accidentally bought this without looking at the enlarged picture and the details on the product page stating this cannot be used with an ultrasonic type of humidifier. Whoops. Fortunately it wasn't all bad and a wasted purchase like I thought. I'm able to use this in my swamp cooler with no adverse effects. The scale buildup and sludge collects in the bottom and all I have to do is give it a quick flush refill and add some more of this water treatment.