Don't disagree. Twas what I tried to say. However, Ethylene Glycol in a 50
percent mixture with typical tap water will support considerable ionic
transport, and the conductivity is substantial. Not up to brine and hence
slave electrode technology is not required ... just maintainence and fresh
inhibitors. pH is the most serious threat to a copper insert.

BTW, I have not followed this thread and so I don't have a clue as to the
original question. Just couldn't stand the nonsense about unconductive
coolant. 2K ohms per square is substantial. The actual numbers are out there.

Frank Grunthaner