With water cooling, it is perfectly safe to let pure water and electricity come together because pure water does not conduct - it's that there are all the minerals and other impurities that conduct.
So get distilled water to put in your water cooling system.
I was thinking it would be cool to have a computer running submersed in water to show off. Just have a wireless keyboard and mouse and the rest goes on a clear surface (to show there are no tricks).
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