First, the biological floating bed method. Plants and other organisms that absorb algae are used to control nutrients in the water body and inhibit excessive algae reproduction, thereby establishing an ecologically balanced system. On artificial floating beds, artificial methods are used to grow aquatic plants such as canna, water hyacinth, and parasol grass on the water, which can not only absorb pollution factors such as nitrogen and phosphorus in the water body, but also inhibit the growth of algae. Second, the biological prevention method is to put fish that feed on algae into the waters, but it cannot be used in severely polluted waters. Third, mechanical fishing method. This is the most primitive and traditional method, which is to use manpower to fish out the water and algae. This method is adopted at the water source in Wuxi. In order to increase the speed, some people have also invented an automatic metal membrane filter. When the power ship is traveling slowly, the metal membrane keeps rotating to fish all the algae onto the ship. The fishing speed is thousands of times faster than manual work. During the salvage process, the functions of flocculation, sedimentation, air flotation, push flow, and algae collection were added. The advantage is that the salvage is thorough, but the disadvantage is that it is still difficult to control large areas of algae. Fourth, chemical method. That is to use chemical killing methods, usually copper sulfate. Copper sulfate was also commonly used in early marine red tide control, and the effect was good. However, divalent copper ions are teratogenic to the metamorphosis of biological larvae and cause severe shedding of feed algae; at the same time, copper sulfate is toxic and can destroy the normal ecosystem of water bodies, so we should be cautious about chemical algae removal. Fifth, remove microbial algae. The beneficial bacteria in the activated sludge are screened and separated, spray-dried to obtain high-density bacteria powder, and then attached to the patented filler through factory-scale production to form an efficient treatment system. Some experiments in Shanghai showed that before the river treatment, the water body was dark black, the water body was seriously eutrophic, and there was no growth of aquatic animals and plants. After 12 days of treatment, the water quality of the Xiachangpu River treatment section has improved significantly, and the water body is clear and has no peculiar smell.