Re: Copper or Pex
If there's nothing wrong with the copper, no need to change it.
Over the years there have been many types of metal pipe, and many types of plastic sold to unsuspecting consumers (and, sadly, plumbers). Only two have proven themselves safe and reliable: copper and PEX.
There are those out there who disdain plastic of any sort, but PEX is different than all the other plastics. It is stronger, doesn't become brittle with time (or at least not for a very, very long time) like PVC or CPVC, doesn't break when frozen, and leaches nearly no harmful chemicals into the water. It's basically the same material as plastic milk jugs.
If your water is not pH balanced (pH 7), you can experience corrosion of copper. If there are certain compounds in your water, they can react with the copper to produce harmful copper compounds, though it's rare. For most people copper is a fine choice, though the materials are more expensive and more labor intensive to install.
For a new installation, my preference would be PEX. And as for brands of PEX, I think Wirsbo/Aquapex is tops.
The "Senior Member" designation under my name doesn't mean I know a lot, it just means I talk a lot.I've been a DIYer since I was 12 (thanks, Dad!). I have read several books on various home improvement topics. I do not have any current code books I can refer to. I was an apprentice plumber for two years.