I have a friend who is using it because she has toxic levels of mercury and aluminum in her system, not ALS. She says it's pretty amazing and gross that you can see the metals floating around in the water. It pulls out all her necessary minerals too, so she was in a lot of pain after one treatment and passed out in the middle of the night in the bathroom. Her period was much heavier too. So now they give her some type of mineral replenishment immediately after the footbath.