👉 Sevier is a type of water treatment plant used to treat sewage. It works by using chemicals and biological methods to remove bacteria, viruses, and other pathogens from the sewage water. The process involves mixing the sewage with chlorine or an alkaline solution, which then reacts with the bacteria in the sewage water to kill them. Seirvens are typically installed in sewage treatment plants where the water is treated before it is discharged into a river or lake.