Once again, you are stuck in a continuous hopeless loop. You are referring to only a footbath that uses an iron electrode. I have never seen one of these. The ones than I have seen use stainless, copper, brass, or titanium. The copper can impart a slight green or blue tint but it is rarely visible.
>- studies show they are not toxins but ferrous material corroded from an electrode.
Once again, you are referring to the use of iron electrodes.
Again you are basing all of your information on one particular model which I have not seen. Do not be so narrow minded and look past the end of your nose.
You do not even need to use electricity or electrodes in some detox foot baths. Even using Epsom Salts in a hot water foot bath can help pull some metals from the body.