Water pollution is the most serious pollution in my city. In the modern era, a series of factories and factories are built, making an increasing amount of discharged wastewater need to be treated. But due to the lack of treatment systems, most of this waste is discharged directly into rivers and lakes, destroying the aquatic environment and the organisms living there. The consequence of this situation is the threat to human health, increasing the risk of diseases of the skin and respiratory system. It can be seen that water pollution is adversely affecting people's lives in many ways. Therefore, it is necessary to offer optimal solutions for local protection that are: Proper domestic waste treatment, Proper wastewater treatment, Always save water. ...