Preferred Residental Water Ph?
Hey, got kind of a wierd question. This all started when my next door neighbor starting developing pinhole leaks in his water pipes, lots of them, over the last year or so. His problems were mostly in his hot water system (which his plumber is telling him is aggravated by the hot water recirculation system in his house), but also in several cold water pipes as well. Well, they're now living the nightmare scenario of having to replace quite a few pipes in his house, and installing something that will "coat the inside of the pipes" (phosphate?). Anyway, we kind of freaked, because we have the same water source (one water provider providing water to our entire subdivision). So had a guy out to test the water.
What he said was that we had small amounts of copper in the hot water, much less copper but still non-zero in the cold water, and we had a Ph of exactly 7 both on the cold as well as the hot water side. Both results were a concern to the tester. We also had a hardness level of 10-11, which by itself wasn't a problem. He recommended a AN that would raise the Ph into the 7.4-7.5 range (to reduce our chances that normal variation in Ph wouldn't allow our water to become acidic), then a water softener to reduce the hardness back to a 4-5 range.
So my question is a simple one. Since 7 is neutral, one might think "Perfect. Don't do anything." But I'm also inclined to think I would like it higher than that just to avoid a possibility that it could dip below 7 and start us down the path of slow corrosion of our copper pipes. I'm also concerned that my cold water is exactly the same cold water that my neighbor has (although his house is about 8 years older than mine), so wondering if an ounce of prevention is worth a pound of cure. Can anyone help here?