I am using tap water and am wondering if perhaps the red coloring could be rust from the hot water tank???? I've had three ionic foot baths since yesterday (2 yesterday and one today)and each time the scum or sludge is a deep red and the same amount (lots of it). ( emerge my feet from 45 min. to 60. Though the water looks clear when I put it in the foot bath container. I wonder if anyone has ever set up a system to do a complete ionic body bath? I want to try it soon. I know that the tub would probably have to be lined with plastic and a person would have to make sure the power part of the whole thing is set up safely as to not fall in the water or touch the skin. though I don't know what would happen if flesh touched the metalclipped and hanging in the water.