Just to give everyone a head's up, the black flaky stuff in the water of the foot baths are part of the machine. I asked my doctor about it when I took a foot bath from him and he said his unit was getting old and he needed to upgrade. Also, when the water turns all those horrible colors and such, that is NOT stuff you are leaching out of your body. All that is, is the salt, water and ion reaction going on all at once. It would still happen if your feet were not in there. What you want to look for is a slime or ring left in the bath, after your cleanse is over with. This is what is supposed to happen if you detoxing right.