Product review (4 stars): It seems to work I think.
I'm kind of lazy girl and don't like to clean up my humidifier everyday. But, I know I should do it everyday for my health. Even if you do it, operating a humidifier would be one of the worst thing that can be attacked your body with germs and bacteria. So, I really need something to keep my body and health from them.
I usually fill out the filtered water inside a tank with this treatment. When I don't clean up for a while, I could see yellow stain. But, after using it, I can see it less than before.