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Originally Posted by Knuckleballerr
Engineer here. This is indeed true. I'd like to add pure water is indeed less corrosive than water with impurities; however the effect is still measurable and it can actually attack nearly anything; especially at high temps and pressures. I like to think of it as having an abrasive force rather than an corrosive force, causing the water to retain impurities as a result of this. So using distilled water has no major advantage.
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I have zero issues using Tap Water. But, if the Distilled Water is Mixed with Coolant it is no longer Distilled Water so it should not have the same properties as pure Distilled Water.
As a side note. I have a 1 Gallon Electric Water Distiller and have been drining moslty Distilled Water since the 1980s. So if I wanted to use Distilled Water to mix with the Coolant it would be even less of an expense for me then someone buying it Retail. I have no plans to use it in anything but the Car Battery if needed.