Final answer:
PEX and galvanized iron are not suitable for potable water systems, while CPVC is a suitable material due to its corrosion resistance.
Explanation:
PEX (cross-linked polyethylene) is not suitable for installation in potable water-supply systems due to the potential release of toxic chemicals. On the other hand, CPVC (chlorinated polyvinyl chloride) is a suitable material for potable water systems as it is resistant to corrosion and the buildup of scale. Galvanized iron pipes, when used in potable water systems, can lead to the release of harmful substances like lead and should be avoided.
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