my son sells those machines so I have used it - I don't think it actually pulls stuff out of your feet except some oily stuff because the oil on top of the water is a different color depending on who is using it. Most of the stuff in the water is just coming out of the array. When I have used it I usually sleep like a baby that night, and wake up feeling refreshed. I think what it does is to ionize your body a bit like taking a walk on the beach and this can assist your body to detox. They call it an ion generator.