I wonder if that's potentially effective treatment for things like chrome cobalt, copper or lead poisoning? Letting a 0 ppm water leach away your nutrients and hopefully the metal contaminants in your body while supplementing everything back to you so you don't die of deficiencies?
A 200 ppm water of lead is different than a PPM of calcium magnesium and zinc. So it's a matter of what is in your water as much as how much? Last real water science was performed by the soviet union and still referenced by the WHO talking about desallination plants providing 0 ppm water so I think it might be a lost cause. Not much profit to be had.
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