If not an electrolysys problem(which I doubt seriously) I would ask if the water supply has done any repairs recently (within your vacinity) which involved chlorination to sanitize the work site.
I recently encountered a similar problem - new pool, less than a year old. Heater pumps sucked up undesolved chlorine granules (used to shock the algea in the pool). Ate up the copper lines( chlorine and copper doesn't sit right to begin with).
The other thing was entrained air inside the piping -"cavitating" - especially after the meter and smaller devices and fittings, created vortexs which often sounded like marbles in a glass, Won't take long to pit copper tubing. edt
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