I think the biochelat helped. Without it the water stayed gray and when I took the biochelat after a week or so, the clay left after draining the water did turned black and then later only parts of the left over clay turned black. I could also see black specs on my skin if I briefly went out of the water only after about five minutes. I didn't see either the last two clay baths I took which means it must removed the heavy metals completely. Plus my thyroid started to work.