A method for treating the zementmörtelaus clothing of pipes and fittings made of steel or cast iron for water lines for the prevention of caused by the cement mortar lining alkalinity of the water, characterized by a chemical or mechanical treatment of the cement mortar lining of the pipes and fittings, before the installation and put into service, for the degradation of the uppermost with alkaline constituents enriched layer of the cement mortar lining.
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