Re: anti freeze
Various things increase the ability of water to corrode things. If it's acidic, of course, and mineral acids tend to be stronger than organic acids. Dissolved materials such as salts or minerals are the main culprit in the modern world. The link talks about water being the universal solvent, it is, but corrosion is not a dissolution process, it's a chemical reaction on the surface of the metal. Removing things from water only makes it less corrosive. Higher ionic strength can make some things dissolve more, some things less, for what it's worth.
To be honest the quote about the pH meter is meaningless and demonstrates someone's misunderstanding of what it all means. Yes ionic strength is low but this does not mean you don't get a meaningful pH reading, you do - odds are it'd be neutral (pH of 7) as it's pretty much pure i.e. no acids or alkalis in there.
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