Quote:
Originally Posted by xtremetechuk
Thanks for all of the posts,
My ignorance has showed in starting this thread 
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You really shouldn't worry about that. Without questions (even potentially silly ones, which yours isn't), we'd never learn anything new!
Any case: Theoretically, if you had a massively powerful and efficient deionising system (current good ones like "Milli Q" units, which generally start at 10,000

USD, are very slow), your idea could work. But you'd have to filter the water to a ridiculous turnover rate to keep the impurity level low enough.
And your hardware might die pretty soon, as pure water is very corrosive (as said earlier)
The option that was used for those who had your idea was made by 3M called Fluorinert. It was used, among other things, in the Cray 2 supercomputer. I believe that current prices are something like 125USD/Litre.

But, that would be pocket change to running a Milli Q system.
And ya, Mineral oil kind of works as the poor-mans Fluorinert. Not nearly as awesome, but tis cheaper.