I am aware of the fact that copper pipes will corrode if they come in contact with concrete, but A.C. will cancel out the corrosive effects due to reversal of current each cycle. I recently replaced our old steel pipes with copper, and at the urging of our town water department, I installed type 'K' semi-soft copper. It was a bit pricy, ($22.00/ft.) but the workers assured me that it will last a very long time. (They don't like to dig up & repair leaky lines, either!) We have a small current flowing through the water mains, but it does not affect K-Copper lines that have been in use for 30 years plus. John Porter
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