<http://schema.org/description>
"Pipe-in-pipe systems are now commonly used to distribute water in many homes. The inner pipe for drinking water is made of a plastic called cross-linked polyethylene (PEX). Are these pipes harmful to health and do they affect the taste and odour of drinking water?"^^<http://www.w3.org/2001/XMLSchema#string>
<http://medicalxpress.com/news/2011-11-plastic-pipes-.html>