Scope: one, a business unit wastewater discharge; 2, subway, basement, air defense systems, pumping station; 3, urban sewage treatment plant discharge system; 4, residential sewage pumping station; 5, hospitals, hotels, high-rise building sewage; 6, municipal engineering, construction sites dilute slurry emissions; 7, the water plant water supply installations; 8, exploration mining and water treatment equipment; 9, sewage farms and rural irrigation.