oh I didn't answer your question did I? My test loop is the one of relevance and it is 25% antifreeze/75% distilled water and it runs 24/7 w/o buildup. Tubing is clearflex, also copper pipe/fittings and some stainless steel, some brass. Aluminum is variable (depends on the block I'm testing).
I had some problems with it once because I had left the res open for a month or so while I went out of town on business and I got some nasty rings in the res as water evaporated (and a bit in the tubes too). Airspirit's *sol mix solved that problem though (and quickly).
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