Polyethylene for smaller ...
Published by Peter Styles, Independent - Consultant (retired)
Polyethylene for smaller diameters, ductile iron for larger ones. Don't use fiberglass, steel or concrete for water supply. Longevity is the main criteria along with ease of use. The ability to make 'under-pressure' connections is also important.
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You can also make the use PVC
Published by Adeniyi Adebiyi, WASH Specialist/ Water Engineer at MSF Holland and Debaf Civil Geoenvironmental Consult