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copper waterblock + aluminum radiator how bad is it?

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Apr 4, 2001
I just wondered how bad it is to mix the two. I would be using distilled water of course. What would you suggest for addatives.
I have a Swiftech MCW462 waterblock. It has an alluminum top with a copper base.I run 85% distiled water 10% antifreeze and 5% water wetter. There is no problem at all with corrosion and it's been running about 5 months now.
use antifreeze and some water wetter and you should be allright. And be sure to always use distilled water instead of regular water.