molybdnate does the same thing (perhaps difft temperature range?). I am unsure whether purple ice also contains silicates or not.
If you've ever read a user's manual for a recirculating lab chiller then they warn not to use auto antifreeze with additives above 35C. They go on to warn that the additives will ppt out on the heating element and mess things up. Sounds familiar right?
I personally think propylene glycol is the additive to use in concert with an inline filter for setup. Propylene glycol can be poured down the toilet but works as well as ethylene glycol (traditional antifreeze) and will deal with any corrosion/mixed metal issues one may encounter. Then I suggest just plumbing the filter in instead of the wb for a day or two to catch any stray crap in the loop from filling, from the rad, whatever. After a day you can drain, collect the filtered water, plumb in wb, and go
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