PS> The water cooling systems for CPUs that I've read reports
 PS> about all used distilled waters. The authors of said
 PS> reports had the same reservations as you at the start, then
 PS> they found out. ;)

Water cooling CPU's is not new.  A long time ago I heard about a
data center that experienced a major power failure.  When power
came up a couple hours later, they weren't anxious to allow the
AC to properly cool the room before they powered-up their chilled
water cooled CPU.  When the humid room air contacted the CPU parts
it "rained" inside their CPU!

The same effect is not unknown around Peltier coolers.

... Never draw fire.  It irritates everyone around you.
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