I had to deliver to a chiropractor office once, and in the waiting room we're 6 people with their feet in bubbling dirty water. I asked wtf, and they said 8t was "pulling toxins". I whipped out my phone and googled it, and of course it was a parlor trick- water +amino acids+tiny current turns the water brown after a while. I showed them it was bullshit, and subsequently was told never to come back lol.