Contaminated land and many brownfield sites can contain hydrocarbons and certain chemicals which can permeate through the pipe wall of standard PE pipe which could result in the tainting and contamination of the drinking water. Additionally the long term strength of the pipe will be comprimised.
PE pipes are now available with an aluminium barrier layer which prevents attack from chemicals left in the ground from previous use (or those still to come) ensuring long term security of supply of clean and un-contaminated water through pipes which remain structurely sound.
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