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I'm not sure which one it is, but I remember doing a heavy metal test that took like 2 hours, and I think it was copper. Back in my days in frigid Maine! But I digress, I would do 2 seperate tests in your case and compare the results of the two to one another. I have never used anything to treat disease, aside from the fresh water dip,(very rarely!) but I am a little on the paranoid side of everything!