Filtration
Sewage enters the filter tank by gravity flow, and the filter tank is equipped with a water cloth weir. The filter cloth is fully submerged, the effluent enters through the outside of the filter cloth, the filtrate is collected through a hollow pipe, and the gravity flow is discharged out of the filter tank through the outlet weir. The whole process is continuous.

Backwashing
Some of the sludge in the filtration is adsorbed on the outside of the filter cloth, gradually forming a sludge layer. As the sludge accumulates on the filter cloth, the resistance of the filter cloth to filtration increases, the water level in the filter tank gradually rises and the cleaning programme is activated. During cleaning, the tank can be filtered continuously.
During filtration, the filter carousel is static, which facilitates the deposition of sludge on the bottom of the tank. During cleaning, the filter carousel rotates at a speed of 1 rpm/2 min. The suction pump sucks the surface of the filter cloth under negative pressure, removing the sludge particles accumulated on the cloth and restoring the filtering capacity of the fibre filter cloth.