I'm doing my plumbing leaks focuses primarily on the elbows and unions. These holes are happening in the external corner joints. As far as I know there is or electrolysis or bites errossion happening from the inside out. The pipes are leaking just after the water meter and are made of copper. I've had six leaks in many months. Most have focused on the beginning of the plumbing of the house. It is a 4 level side-split and if you go behind a wall to shoot myself and having to put a question in the suicide section. Well, I have the answer here. It is pitting corrosion and probably is caused by electrolysis if you see pitting on the pipe. It occurs mostly in plumbing pipes of dissimilar metals in contact with other metals such as brass, copper and galvanized. One way to alleviate the problems of electrolysis is to ensure that when there is a change of pipe materials is to ensure a buffer zone of non-metallic pipe, such as PVC. I would make sure that direct coupling meters past brass water meter (called Spud meters) there is a break of PVC and then copper. Elsewhere the pipe material changes, you must have a buffer of non-metallic pipes. Also check for electrical cables that may be connected to ground pipes. This could also be a source for electrolysis problem. GOOD LUCK
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