Product review (1 stars): DANGER! Use this at your own risk. Contains unsafe chemicals!
I have been using the Sunbeam version of this water treatment (Model S1706)- same product with different labeling, like the humidifier itself. I used it all this past winter, and I got mixed results with its ability to prolong the pad's life. Then I began to notice chest pains off and on, but only brief twinges of pain. Nothing lasting. After weeks of it I began to get a little concerned that it was something more serious than just lung irritation. I started to think the worst, but I wasn't completely convinced it wasn't allergies.

I decided to experiment, so I discontinued using this water treatment and ...the pains immediately went away. This is not a scientific investigation, just a case of cause and effect. After researching the problem, I discovered that I am not alone. Others have reported chest pains with this product. My opinion is that if it is causing chest pain, it is something to be avoided at all costs.