Distilled water is less conductive than tap water, and it doesn't leave mineral deposits when it dries. It doesn't really corrode metal, although you shouldn't have aluminum and copper pieces in the same loop.
Distilled water has essentially no impurities, so theoretically nonconductive. So, it won't deposit junk in your loop, and it probably won't kill stuff if your loop leaks. It is also much more effective at transferring heat than most other fluids you might put in your loop. I think only Feser(?) has fluid that's better than pure distilled water, as far as temps go.
Distilled water contains less minerals than does tap water and thus is better for using in a watercooling loop. Since it has less minerals it is therefore less conductive than tap water. No, distilled water will not corode a loop. However, if you have mixed metals in your loop (ie. aluminum & cooper) then you will need to add an anti-corrosive to the loop in order to prevent galvanic corrosion.
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