Healthy Domestic Water pipes

[Richard Dawson]

Water pipes in refurbishment
I've been asked a question by a client if copper pipes or Hep2O are healthier than say Uponor or Mepla (Gerberit) pipes.
As it's some time since i consdiered this question i though i would ask if any members have a view or preference  Putting cost aside which is the most green to use?
I was concerned that some manufacturers have composite pipes with a metal content and i have always tried to be as healthy and green as possible.
any suggestion please gratefully recieved
Richard Dawson