The best material does depend ...

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The best material does depend on a number of factors, including pressure, size and ground conditions. The issue with the use of concrete pipes for treated water is the potential for leaching from the pips causing elevated ph and potentially reduced disinfection efficiency. I would support the use of MDPE, HDPE, PVC, ductile iron, or GRP, as I said depending on size, pressure and of course avilability of the products.