As one automatic sewage purifying device can remove out particles, suspended matter in water, it?s made up of reducer device, sewage purifying body, electrical drainage switch, pressure controller and electricity panel. This cleaning and drainage equipment is applied to power station water system, pump station, air-conditioner coolant system, Fire alarm system and automation system, especially using for water & electricity station without operators at spot operating. Features: 1/. Large filtration coverage while with low filtration impedance; 2/. Stable operation and little impact on discharge pressure, and cleaning is performed in accordance with the requirement of online operation; 3/. Small size and long time of using, which is easy to operate; 4/. All internals are made of anti-corrosion materials, filtrate core and basket being made of stainless steel; 5/. A run-in of power supply AC 380V/50HZ can easily enable automatic running while timing, differential pressure, manual operation, and fault alarm can be achieved, as well as computer network controlled operation. 6/. Adopt PLC automatic controller.