General production enterprises will use steam, and steam must use boilers.

In the process of boiling water to generate steam, the boiler evaporates pure water from boiling tap water (or groundwater). Over time, a lot of metal impurities will remain in the boiler. Most of these metal ions are attached to the boiler wall in the solid form of carbonate (that is, boiler scale). In the long run, the boiler is attached by a large amount of carbonate, which leads to uneven heat conduction. It is easy to have an explosion accident. Therefore, it is necessary to clean these metal salts regularly. The most commonly used is trisodium phosphate. Adding proper amount of trisodium phosphate can make the scale fall off naturally and reduce the re-formation of scale; Because trisodium phosphate has the characteristics of low cost and good effect compared with other water softeners.

Trisodium phosphate is considered as a boiler water softener with high cost performance.