Magnetic separation technology is a new water treatment technique developed based on the advancement of rare earth permanent magnet technology in China. It uses an external high-gradient magnetic field to separate magnetic floccules formed in the water. The principle involves adding magnetic seeds and coagulants to the water, causing suspended solids, colloidal substances, algae, and phosphorous to form micro-floccules that can interact with the magnetic field. These floccules are then separated from the water by magnetic force, with the entire process taking about 4-6 minutes. Over the years, magnetic separation technology has matured, and the magnetic coagulants used are conventional water treatment agents that do not cause secondary pollution, making the process safe and reliable.