What is the typical phosphate used for corrosion control in water systems?

Orthophosphate is commonly used in water systems for corrosion control due to its effectiveness in forming a protective layer on the interior surfaces of pipes. This layer, composed mainly of iron phosphate, helps to mitigate the leaching of metals from pipe materials, particularly lead and copper, by providing a barrier that limits the metal's exposure to the water.

The use of orthophosphate in treatment processes is favored because it is readily soluble and quickly integrates into the water system, offering immediate corrosion control benefits. Furthermore, its chemical structure allows it to perform well in various pH levels typically found in drinking water, making it a versatile option for utilities looking to enhance the quality and safety of their water distribution systems.

Understanding the specific role of orthophosphate and its advantages helps water operators recognize the importance of selecting the right corrosion control strategies to protect both the infrastructure and public health.