The multi-column automatic backwash filter is composed of a shell, a filter element, a backwash rotary mechanism, a differential pressure controller and an electric control part. It is an advanced, efficient and easy-to-operate fully automatic filter device.

How Backwashing Works 

The multi-column automatic backwash filter is composed of a shell, a filter element, a backwash rotary mechanism, a differential pressure controller and an electric control part. It is an advanced, efficient and easy-to-operate fully automatic filter device. 

The multi-column automatic backwash filter adopts a high-strength wedge-shaped wire mesh filter element, which automatically cleans the filter element through pressure difference control and timing control. When the impurity in the filter is accumulated on the inner surface of the filter element, causing the inlet and outlet pressure difference to increase to the set value, or when the timer reaches the preset time, the electric control box sends out a signal to drive the backwashing mechanism. 

When the mouth of the backwash suction cup is directly facing the inlet of the filter element, the drain valve opens, and the system releases pressure and drains water, and a negative pressure zone with a relative pressure lower than the water pressure outside the filter element appears on the inside of the suction cup and the filter element (backwash pressure difference value Controlled at 3~4 times of the filter differential pressure value). 

Part of the net circulating water is forced to flow from the outside of the filter element to the inside of the filter element, and the impurity particles adsorbed on the inner wall of the filter element enter the pan with the water flow and are discharged from the drain valve