At present, the coagulants used in the market are mainly divided into three categories: inorganic coagulants, organic coagulants and polymer coagulants. Each type of coagulant has its own unique chemical properties and application scenarios.

The main types of water treatment plants are: 1. Drinking water treatment plants, 2. Sewage treatment plants, 3. Industrial water treatment plants, 4. Seawater desalination plants.

The prices of aluminium sulfate (alum) and polyaluminium chloride are relatively low and suitable for large-scale applications. Although polyacrylamide (PAM) has a good flocculation effect, it is more expensive and is suitable for scenarios with high requirements for flocculation effect volume.