The M100 pistonless models remove dirt particles as water flows through the coarse and fine screens (1) to the outlet. The particles accumulate on the fine screen eventually increasing the pressure differential between its inner and outer surfaces. At a preset value, the rinse controller (3) opens the flushing valve (4). The pressure in the rotor chamber (9) drops, releasing a strong backflush stream that flows through the nozzles (5) and then out the drain. The drop in pressure creates the suction effect of the nozzles. This effect actuates spot cleaning of the fine screen's inner surface directly in front of the openings of each nozzle. The two stroke helical movement of the dirt collector assembly (8) ensures that the nozzles sweep the entire inner side of the fine screen. Backflush water flows through the collector pipe (6), via the rotor (7) to the flushing valve forcing the dirt collector assembly (8) to spin. The first backflush stroke begins when the pressure-drop in the rotor chamber (9) and the inlet water pressure of the filter drive the spinning dirt collector assembly upward. When the first stroke is completed, the flushing valve (4) closes and after a very short interval the rinse controller (3) activates the second (downward) backflush stroke. The dirt collector assembly spins downward returning to its original position.

The M100 piston models remove dirt particles as water flows through the coarse (3) and fine screens (4) between its inner and outer surfaces. At a preset value, the rinse controller (12) opens the flushing valve (9). The pressure in the rotor chamber (5) drops, releasing a strong backflush stream that flows out through the nozzles (6) and then out the drainage pipe. The drop in pressure creates the suction effect of the nozzles (6). This effect actuates spot cleaning of the fine screen's inner surface directly in front of the openings of each nozzle. The two stroke helical movement of the dirt collector assembly (7) ensures that the nozzles (6) sweep the entire inner side of the fine screen. Backflush water flows through the collector pipe, via the rotor (8) to the flushing valve (9) forcing the dirt collector assembly (7) to spin. The first backflush stroke begins when the pressure-drop in the rotor chamber (5) and drainage from the piston (10) drive the spinning dirt collector assembly toward the piston. When the second stroke is completed, the rinse controller (12) initiates the next backflush stroke. The dirt collector spins towards the filter cover returning to its original position.