I've done the footbaths too at my naturopaths. They're callec ionic footbaths (ion cleanse footbaths). There's been some debate as to whether the colours that come out actually correspond to the detoxing organ, but I've found them effective none the less at removing heavy metals. There's nothing to "prove" the theory, so it's a bit iffy. I felt better doing them though :) And I know some people who get inflamation pain relief by sticking the painful limb (ie. arthitic hands) in the footbath. You can feel it tingling.