The City's annual water main cleaning and lining project rehabilitates existing water mains to improve water quality and available flows for fire-fighting. Hard deposits (formed by corrosion) are removed from the interior of the main and a thin layer of cement mortar is applied to the interior pipe walls to prevent deposits from reforming. Where necessary, temporary water pipes are used to supply water to customers during construction. The City's contractor is Mainlining America, Llc. They have successfully completed several past Water Main Cleaning and Lining projects for the City

[source: City of Rochester website, 2018-Apr-11]