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Earl, the Toyota people told me (back when I owned a MR2) to imagine tiny bits of sand floating around. Here's what the Automotive Service Association has to say:
A lot has been written about the role of silicates in antifreeze. Yes, they do help prevent corrosion of the internal aluminum components that are increasingly used in engines. But they also tend to drop out of solution to form solids. As a solid, they can clog the system or damage components such as water pump seals.
I have no idea what Subaru has to say on the issue, I was simply thinking of what a pain it is to change out the pump on the SVX.
BTW, some European car makers recommend phosphate free antifreeze, but I understand that's because of the minerals in their water - they get the same sort of problem with phosphates forming hard particles and dropping out of solution.
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