[linhat]

Just to be clear, I meant that water collected from pure air should have no salt in it at all, so drinking large amounts of it will be unsafe as it will draw those salts from your body (osmosis and diffusion), just like drinking large amounts of seawater might increase your blood pressure, but more importantly, it's very hard for your body to get it out of your system, your urine produced by your kidneys is not saltier than saltwater, so you need more water than you can drink (with seawater) to get it out again.

So my original question still stands, is it unsafe to drink large amounts of water collected from pure air and do they have to take care of that in any way? Or will simply eating salty food fix it? I still have not found an answer in the article.

EDIT: From further below in the thread:

http://en.wikipedia.org/wiki/Hyponatraemia

and its counterpart:

http://en.wikipedia.org/wiki/Hypernatraemia

[hcarvalhoalves]

It's dangerous if you're dehydrated and drink a lot of soft water (that's the term for water with low/no mineral content) at once, otherwise it's okay as long as most minerals come from the diet.

Tap water in most places has a GH/KH of 0 (to avoid clogging pipes with carbonates) and nobody dies from it.

[joveian]

Specifically, if your body is low on electrolytes it will hold water until it gets them and that holding of excess water causes problems. However, almost any amount of food is sufficient to prevent that.

However, in this case I tend to doubt the water will be all that pure due to dust; I'd guess it will actually have a decent mineral content. Commercial water purifiers often produce mineral-free water and the only issue I have heard of in connection with this (at least as long as you are eating any food) is that most people find that the resulting water tastes bad. Adding minerals back is not difficult at all.

Edit: Sounds like it is a little more complicated than that; the WHO paper that the Wikipedia article that sbierwagen cites is a good read with 16 pages on this topic. One thing they mention as a potential issue is that cooking food in low mineral content water can leach minerals from the food. If the food is then consumed but the water isn't, that would lower mineral intake (discarding water used in the first cooking of some beans is necessary because it removes toxins from the beans but these beans can be a good nutrient source, so this could still potentially be an issue where water is scarce). The Wikipedia article could be skipped, though, so here is a direct link to the paper: http://www.who.int/water_sanitation_health/dwq/nutrientschap...