eli5: Why can’t you drink Demineralised Water?

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At my local hardware store they sell something called “Demineralised Water High Purity” and on the back of the packaging it says something like, “If consumed, rinse out mouth immediately with clean water.”

Why is it dangerous if it’s cleaner water?

In: Chemistry

19 Answers

Anonymous 0 Comments

Depends on the purity of demineralisation. DM water usually contains 1-10m/L (ppm). Generally safe unless you’re exclusively drinking it

100% demineralised will definitely cause massive harm though, because it’s so hypotonic. Your cells will start absorbing water. This disturbs the balance of electrolytes (electrically conductive ions) in your body. This is most seriously a problem in the brain, where water poisoning can lead to brain damage, coma and even death.

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