Scale inhibitor refers to a class of agents that can disperse insoluble inorganic salts in water, prevent or interfere with the precipitation and scaling of insoluble inorganic salts on metal surfaces, and maintain good heat transfer effects in metal equipment.

Sodium tripolyphosphate is an inorganic phosphorus-containing polymer scale inhibitor. Poverty of water resources has always been a major problem facing my country, especially in recent years with the rapid development of my country's industrial production, industrial water consumption has risen sharply. If the direct-flow cooling water is changed to circulating cooling water, more than 95% of the water can be saved. However, after replacing the continuous cooling water with circulating water, as the cooling water is continuously circulated and concentrated during use, the mineral content in the water will continue to increase, and a large amount of dissolved oxygen, dust, spores and bacteria will be brought in from the cooling tower, and the water quality will change. As a result, the entire cooling water system has caused much more serious problems such as corrosion, scaling, bacteria and algae compared with the use of through-flow cooling water. An effective way to solve these problems is to add a scale inhibitor to the circulating cooling water. Sodium tripolyphosphate is also used as a scale inhibitor in water treatment.

In cooling water treatment, the most commonly used inorganic phosphorus-containing polymer scale inhibitor is sodium tripolyphosphate. Adding a small amount of polyphosphate to water can destroy the normal growth of CaCO₃ and other crystals, thereby preventing the formation of CaCO₃ scale. The anti-scaling mechanism is mainly through partial functional groups in the molecule or electrostatic force adsorption on the active points on the crystal surface, so as to slow down the growth of the crystal, so as to keep the crystal in a microcrystalline state and increase its solubility. This anti-scaling mechanism makes the agent have a threshold effect.

Sodium tripolyphosphate produced by Chongqing Chuandong Chemical is industrially produced by thermal method, with high purity, less impurities and more stable quality.