1. First, lead the water from rivers and other places to the treatment plant, and at the same time, filter out the large objects with a strainer.

2. Alum is mixed, clay and alum are bonded to form alum flowers, and then water is precipitated to filter out the alum flowers.

3. When the water flows through the sandstone group, some organic matter and chemical components are filtered out.

4. Add chlorine to the water to kill the remaining microorganisms.