Stainless steel can provide excellent service underground. It is stronger than polymers and copper and its resistance to chlorides and acidic acids is significantly better than carbon or galvanised steels.
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Image pictured is the Appin Sewerage Treatment Plant, NSW. Fabricated and installed by ASSDA member and Accredited Fabricator Roladuct Spiral Tubing Pty Ltd using 316 grade stainless steel. Image courtesy of Roladuct Spiral Tubing Pty Ltd.