Don't know what's wrong with metal mixture in a loop. Had loops working for over 2 years with blocks from Innovatek in Aluminum and EK in Copper and never ever had a single spot of corrosion. It's all in the cooling fluid...
Anyway, back on topic... That product should have never been advertised as Hydro Copper, it's fooling the consumer and we all know Copper is a better heat conductor and works better (and is more expensive as well) than Aluminum. Looks like a failto me.
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