Yep these things are total bunk. Many people explain the effect, its basic chemistry. I think that there is even a youtube video showing it, with no ones feet in the bath, same thing happens. Ive actually done one, my wife insisted they worked so I went with her. After I showed her all the proof that its just a highschool level chemistry thing and she agreed. We only use DMSA for detoxing as its known to remove lead, mercury and at least 15 other heavy metals. We buy it on ebay from this guy dmsachelation.com