Cut & Paste: (Just FYI)
"If you have copper pipes for your home’s water supply and you see greenish-blue stains on your sinks, showers or toilets, it is very likely that your pipes are corroding. In our local area (the Central California foothills) we would estimate that over 95% of the problem water complaints about “blue stains†are the result of corrosive water slowly dissolving copper pipes. When well water from these homes is tested, the test results almost always show low pH, low hardness and low total alkalinity."