What do polyphosphates help to reduce in water treatment?

Polyphosphates are commonly used in water treatment processes primarily to reduce corrosion in pipes and fittings, as well as to minimize the formation of calcium scale in the system. When added to water, polyphosphates create a protective barrier on the interior surfaces of pipes, which helps to prevent metal ions from leaching into the water supply. At the same time, polyphosphates bind with calcium and magnesium ions, which helps to inhibit the precipitation of these minerals, thereby reducing scale buildup.

The reduction of corrosion is particularly important because it not only protects the infrastructure of the water system but also ensures the safety and quality of the drinking water by preventing the leaching of harmful metals like lead and copper. Additionally, reducing calcium scale contributes to operational efficiency, as excessive scaling can obstruct flow and reduce the effectiveness of other treatment processes.

In summary, the role of polyphosphates in water treatment is vital for maintaining both the safety of water supplies and the longevity of the infrastructure used to deliver that water, making the reduction of corrosion and calcium scale their primary function.