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Copper has several redeeming qualities. It last long, does not rust, and won't grow bacteria. It also does not interact with water, making it good for pipes.
to make sure no unsterilised water or faeces det through cracks in sewer pipes
copper
Copper, Brass, Yellow Brass , Red Brass, Galvainzed steel, Galvanized wrought , Yalloy
Ideally, they should be constructed of light weight materials like reinforced aluminum