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Old 05-04-2007, 04:39 PM
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Sa'ar Chasm Sa'ar Chasm is offline
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Putting aside the fact that purified water should be relatively easy to come by, how would you keep an official water sample pure at 7.0 for very long?
Keep it sealed under nitrogen or argon and never, ever, ever open it.

Which may not be very helpful if you want to use it to calibrate something.
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