Metal pipe and plumbing materials have historically had issues with corrosion, whereas HDPE polyethylene piping is one alternative. High Density Polyethylene pipeline systems have been used by consumers for drinking water supply since their introduction in the 1950s. The plastics industry has taken great responsibility in ensuring that the products used do not adversely affect water quality. HDPE PE100 Grade Granules is made of food grade quality, which insure good drinkable water. It is always recommended to use only Certified quaity standard NS-40 HDPE Pipe for drinking water