Nothing yet, besides biocide and anti corrosive additive. So much disinformation out there regarding this. From what I've researched (from engineering sites and not PC enthusiast sites) the 10 feet of nylon hose that separates the aluminum from the copper is more than enough to nullify the electric potential between the 2 materials. I'll check the loop in a few months, if I see anything I'll add a stainless anode to the loop.
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