Originally Posted By: kschachn
And yes, softened water has some minerals in it but it is mostly sodium. Most any calcium or magnesium ions are gone, as well as the iron. It doesn't matter though as it's not the total mineral load. As long as the water is undersaturated in some mineral it is capable of dissolving more. What specific minerals are lacking in distilled water that make it dangerous to the human body? And of those that you may mention, are you otherwise drinking water that is saturated in them? Are you saying that distilled water is dangerous because you obtain no minerals from it or because it somehow "strips" minerals from your body? That is the usual criticism of distilled water.
The argument that it is dangerous falls apart when millions of people are drinking water here in Milwaukee that is nearly devoid of any mineral content whatsoever. Are you saying that water somehow magically will not dissolve any more of the necessary minerals? Unless your only source of trace minerals is your water then why is it not dangerous as well?
I have a minor in chemistry so I know that's only enough to be dangerous. But I do know that many people who have surface water as their drinking water are ingesting water with very low mineral content. As far as I know they aren't dying from it.
Couple points, if you remember the solubility laws, sodium doesn't make an insoluble salt, so softeners replace scaling salts with Sodium...no scale, still salts.
At the power stations, we have lots and lots of water, some deionised (anion, cation, and mixed bed ion exchange resing), and while circulating through the system, the condesnate is "polished" by again being passed through ion exchange resins...it's really really pure. The Cooling water is river water cycled uo some number of times in the cooling towers.
There are leaks...
If the heavily salt laden water drips on concrete, it runs off.
If the ultra pure water drips on concrete, it eats out the cement, leaving the sand and aggregate.
(Should mention that I have also experienced some HIGHLY saline ash dam water that runs with a quite low pH, and it sort of reacts and leaves a crust).
The ultra pure water and concrete example while dramatic to see industrially doesn't (IMO) apply to the myth of destroyig your teeth and bones...it's "hungry" for ions, for sure, but your "ash" ingestion per day is massive in comparison to your water consumption.
A few hundred thousand submariners set a good test case also, I believe.