Dear Davis, I spent well over ...

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Dear Davis, I spent well over 20 years either as COO or CEO at a large water system in the US. Stay away from galvanized iron. Zinc is notoriously corrosive. Ductile Iron is OK, but ensure joints have adequate thrust restraint and I would recommend polyethylene lining as normal practice. HDPE is great if one can afford it. Thick walled can also be used for directional drill carrier pipe.