If blue or green staining is present in sinks, showers, bathtubs or toilets, this means slowly but surely the copper tubing in your house is being destroyed from the inside out. Over time the copper tubing will become thinner and thinner until it can no longer hold water pressure and pinholes will start occurring. The photo shows a piece of copper tubing that developed pin holes, when we cut the tubing out to replace it, it cracked in half because it was so thin. Notice the blue/ green staining on the inside of the pipe as well. An acid neutralizer is the proper water treatment system needed to prevent further damage to copper tubing when you have acidic water.