Plastic Water Pipes Affect Odor And Taste Of Drinking Water. See http://www.sciencedaily.com/releases/2007/08/070823141100.htm
See the following quote in the above article: "PEX-a had fewer odors and organics release than the PEX-b pipe."
Lead Leaching And Faucet Corrosion In PVC Home Plumbing. See http://www.sciencedaily.com/releases/2008/06/080602091241.htm
Has anyone encountered these problems?