Quote:
Originally Posted by digital rules
Hard water can be problematic for the system, especialy the radiator. (Electrolysis & corrosion) Pre-mixed anti-freeze uses distilled water for this reason.
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I see you are from Northern Virginia. West Virginia has some notoriously "hard" water. That situation doesn't apply to everywhere else, however.
Pre-mixed anti-freeze is a very recent marketing item. Previously, everyone mixed the concentrate with ordinary water, depending on the amount of freeze protection needed.