The Bishui Sewage Treatment Plant, the largest sewage treatment plant in Tongzhou District, Beijing, has been upgraded to improve the water environment and meet the needs of further urban development. Strive to be more environmentally friendly, more efficient, and adopt a fully enclosed sunken treatment system, becoming the first model of domestic proprietary technology to surpass and replace international technology.SOLARLIGHT Tubular Daylight Dvice provides green, non-electric, natural light illumination.