Re: How about pure distilled for a copper only rig?
Maybe best thing would be to go not with the standard antifreeze for car usage.
There are some special liquids out there which are colourless.
As far as I know you need a certain percentage of concentration to help at all, also it does not only help preventing galvanic reactions but also raises the temperature the liquid can accept. You surely would not want to have bubbbles created by heat in your system.
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