U-PVC (un-plasticized polyvinylchloride) pipes and fittings exhibit excellent resistance to aggressive environments both naturally occurring and as a result of industrial activity. They are resistant to almost all types of corrosion, either chemical or electrochemical in nature. Since U-PVC is a non-conductor, galvanic and electro chemical effects do not occur in u-PVC pipes.
U-PVC Pipes and fittings are often used in the following circumstances:

For drinking water pipe distribution systems, both main and supply lines

Sewer and discharge pipe systems
Due to its non-metallic nature, the material used is totally resistant to all forms of metallic corrosion.
Aggressive water resulting from high sulphate soils and low hardness water will not attack U-PVC.