Bobkoure: I just finished HS Chem... copper will be reduced while the aluminum will oxidize, so the oxidized aluminum (rust) will be formed as a result of corrosion. I would think that adding a metal with a higher activity (higher activity= more likely to corrode. Aluminum is more active than copper, so it will oxidize) such as zinc would eliminate the risk of corrosion. Water heaters have sacrificial zin anodes, so why not throw a tiny chip of zinc into a resevour or other receptical in your loop?
Brian
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