As I always dream of living in a better/healthier house, sometimes I have a look at building materials and systems. Here is one that caught my attention: water piping with PEX (crosslinked polyethylene).

Below I'll include the URL for the info I found regarding this topic, as it is too long to post it here. After reading the first few pages with the characteristics of this material you'll have a hard time if you want to interrupt your reading. Enjoy!

http://www.huduser.org/Publications/PDF/pex_design_guide.pdf

Replying to [germex]:

I have red the pdf. but as i am not too familiar with English, i stop at half of the file .

wow..it can bend 90 degrees. yes, that would eliminate extra cost. No need fittings, less laboring and quicker installation. as HDPE is a right choice to use. hard, high temperature resistance, and as your post title, a healthier houses can be created. it resistant to corrosion and chlorine.

An architectural design guide will be easier if we use this system. most architect or any construction engineer will have their extra time for a coffee break .

But, one question..does it suit for such tropical countries?? regarding to costs and efficiencies.

Replying to [BUMshells]:

To answer your last question I would have to know about prices, but I normally look more at other benefits. Copper forms toxic compounds if the water contains oxygen (all drinking water does), iron gives at least an objectionable taste (and I beleive toxics, too, under certain circumstancers), and PVC seems to be coming straight from the witch's kitchen. In Berlin, Germany, it's already banned from indoor uses.

Therefore I prefer PEX, without really looking at the price. Of course, if there is a way lowering it, I'm all for it, but it's not my primary concern.