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fuhr filters use high-strength wedge wire screens to automatically clean the filter elements via differential pressure control and timed control. When impurities accumulate on the surface of the filter element, causing the inlet-outlet differential pressure to increase to the set value, or when the timer reaches the preset time, the electric control box sends a signal to drive the backwash mechanism. When the backwash suction cup opening is aligned with the filter element inlet, the drain valve opens. At this point, the system depressurizes and drains, creating a negative pressure zone between the suction cup and the inner side of the filter element, where the relative pressure is lower than the water pressure on the outer side of the filter element. This forces part of the clean circulating water to flow from the outside of the filter element to the inside, adsorbing onto the inner wall of the filter element.