This is a newer “detoxification procedure” that I do not endorse at all. It is quite dangerous, in fact, though it starts our harmlessly enough. Adding salt to drinking water will cause the removal of a few toxic metals by an osmotic mechanism. The problem is that it may also remove vital or essential minerals slowly and insidiously. It can also subtly dehydrate the body. Therefore, I do not recommend this procedure at all.
Do you add Seasalt to water? - I do (have for years)