Well, I had my 2nd ionic foot bath(went to a clinic for it)...and it only went from clear to yellow to orange...to only a little brown...with hardly any sediment at the bottom...I felt awesome after...I went shopping, cleaned the house, exercised....I haven't had this much energy in years......I must be finally free of metals, since it did not go black...I guess it pulled toxins from my urinary tract, liver and joints....I am going again in a few weeks...so i'll let ya know what happens then.....These foot baths work amazingly...and I recommend them to anyone...I do not have my own machine...I pay only $25 for each treatment, so it is affordable...Thanks Sandra P