What is PEX repiping? In short PEX stands for “cross-linked polyethylene.” Polyethylene is the material and the X refers to the cross linking of polyethylene. This material and process is becoming more common due to pollutants in the environment and added chemicals that are used to treat water supplies to disinfect water.
With PEX piping the environment and additives will no longer affect your water supply as even copper longevity has been affected by these conditions.