On Fri, 30 Apr 2004, Andrew Grebneff wrote:

> Pure (multidistilled) water IS corrosive; it will dissolve (leach)
> chemicals/elements out of nearly everything it touches until it
> attains an "equilibrium" (actually there is no such thing as
> equilibrium... it is an ideal, not a fact).

Yup, where I work we've found that reverse-osmosis purified water is
actually pretty corrosive to metal.

I don't think this is a big concern in a cooling system, though -- you're
not always flowing new water in, so what's in there will quickly collect
ions from the cooling system and reach "equilibrium".

David Brodbeck, N8SRE
'86 Volvo 240DL wagon
'82 VW Vanagon Westfalia Diesel