Domestic hot water system is a recirculating system on a city water source that is typically somewhat hard, but not usually corrosive. Tubing has developed thinning walls and pin hole perforations throughput the system (1" through 2" tubing). There does not appear to be any dissimilar metal conections, nor is there high velocity flow conditions. Pipe does not have any scale buildup. System is six years old. The pocking and erosion appears to be the heaviest at fittings and joints. Most pocking shows bright copper, but some areas have oxidized (green patina). Would like to find the cause of the tube errosion.
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