Sewage flows into a pool body equipped with a turntable filter device, and the pool is provided with water inlet and outlet weir plate facilities. With the accumulation of sludge on the filter cloth, the filtration resistance of the filter cloth increases, the water level of the filter gradually rises, when the water level reaches the set backwashing value, the signal is sent to the program control system through the float water level switch, the automatic control system will control the backsuction equipment according to the PLC program to carry out the backsuction work. The fiber turntable filter equipment is simple and compact, with few ancillary equipment, and low investment in the entire filtration system. The filter cloth turntable filter can be continuously filtered when cleaning. However, the sand filter cannot be continuously filtered during backwashing. In order to ensure continuity, it is necessary to set up an intermediate reservoir in front of the sand filter or use multiple filters to work alternately. The filter cloth turntable filter uses a small water pump to automatically clean the water after negative pressure suction filtration, eliminating the need for backwashing pools, water towers, etc. required by many traditional filters. Due to the high backwashing strength of traditional filters, gas and water recoil requires not only a high-power water pump, but also two larger diameter pipe and valve systems for gas and water. The complete system is many and varied, and the investment is high. The automatic control system is huge and complex.