Can you at least elaborate on why your stance hasn't changed given my link? That's sort of why I posted it, he addressed your specific concern... it's not just that the water changes, as the opaqueness, smell and such are different when your feet are actually in.
Newport, Trapper, and some other names I've come to know from Iodine forums and such all said it did have a positive effect on their bodies... are you saying that this is a placebo effect? Or are you saying it doesn't work as effectively as your Colloidal Silver suggestion? Or something else?