Steel and concrete tanks are protected from corrosion and deterioration below and above the water line by Purethane^®. It is impermeable to water and has very low water vapour and oxygen permeability. Purethane^® 386/9000 is highly inert, non-toxic, odorless and non-conducive to bacterial growth. It has negligible leach rate.

Steel, ductile iron, concrete pipelines and clarifiers are protected by lining with Purethane^®. Its slickness reduces the friction flow factor saving pumping horsepower. Purethane^® linings will not chip or spall. Purethane^® lined elevated water towers are easy to clean.

The internal corrosion of pipes and fittings can have a direct impact on the concentration of some water constituents including Cadmium, Copper, Iron, Lead, and Zinc. Corrosion control is therefore an important aspect of management of a water supply system. (WHO , GENEVA " Guidelines To Drinking Water Quality, 1992).

Cement mortar, in which the aggregate is fine sand, has been conventionally used as protective lining in iron and steel water pipes. Cement is subject to deterioration on prolonged exposure to aggressive water - either due to the dissolution of lime and other soluble compounds or to chemical attack by aggressive ions such as chloride or sulfate - this may lead to structural failure of the cement pipe. A pH of 8.5 or higher may be necessary to control cement corrosion.