Well, I think the only consensus reached was that different situations need different mixtures. Are you watercooling to ambient, or waterchilling (below ambient)? Are you going to have a submerged evaporator coil (where aluminum and copper are touching each other in the solution) or any there places where an anodic and cathodic metal will make a connection? If you're going below ambient are you going below freezing as well? How far?
In my waterchilling setup I am shooting for a maximum low temp of maybe 10C below freezing (optimistic I'm sure) and an average temperature between 0C and 10C. It has a submerged evaporator coil, and reading through the articles and threads on this site I've decided to go with 90% distilled water and 10% Hyperlube, which will prevent slushing and freezing near water's freezing point, stop or slow down galvanic corrosion, and act as a mild algaecide (is that the correct word?) from what I've read.
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