As a high-quality coagulant for water treatment, how to judge the quality of polyferric sulfate in use? The factors affecting the quality of polyferric sulfate include iron content, basicity, iron density, pH value, etc. among them, iron content and basicity are two of the most direct and main product indexes, which can directly reflect the effect of polyferric sulfate in use. The density and pH value of polyferric sulfate are also closely related to the quality of polyferric sulfate. The density of polyferric sulfate refers to the ratio of mass to volume of polyferric sulfate. The density of polyferric sulfate is about 1.3, which belongs to qualified products. When the density reaches 1.45, it basically belongs to high-quality products. The higher the density, the better the quality of products. Due to the production process, the qualified pH value of polyferric sulfate is between 2-3. Once the pH value exceeds the range, the quality of polyferric sulfate will get worse, so the pH value is also a factor that can not be ignored. The iron content of Gongyi Filter Industry Co.,Ltd polyferric sulfate is generally between 11% and 13%, the density is about 1.33 to 1.45g/cm3, and the pH value is about 2-3, which is also the basic product quality requirements of our company.