I never did get much of an answer on this last time I posted it, so I'll mention it again here since it's kinda related. As soon as I can get my hands on some (we ran out) I'm going to add a small amount of Sodium Metabisulfate to my coolant. It's used in home-brewing to sterilize the equipment before sealing the containers to let the brew ferment, and most definatly will kill everything in a computer cooling system. I doubt it will help corrosion much at all (it shouldn't affect galvanic-corrosion/battery effect at all) but it is an anti-oxidant. Since a 5-second quick rinse in a fairly low concentration solution of the stuff is all thats needed to sterilize brewing equipment I expect it should take a very small amount of it in a cooling system (and left in the system) to keep it growth-free, and so should not effect cooling performance much if at all.
I'm just waiting for my dad to start another batch of wine so I can steal some from him when he cleans all the equipment again - if anyone else wants to try it though you can go down to any home brewing supply store and get some.
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