The problem of pin holes are due to the presence of different chemicals in the water, like magnesium, calcium, cholorine etc. When copper reacts with cholorine it forms copper choloride which is an acid that starts choroding the surface of copper pipe and creates pin holes at the weakest point of the pipe which normally happens to be joints of the pipe considering that there are no manufacturing defect in copper pipe itself.
Alternating current do not contribute to this problem because the electrolytic process is only possible with DC. (Direct Current) Anwar Pasha
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