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Works Water from the inlet into the coarse filter, the latter through the thin filter out. Impurities in the water will gradually accumulate in the filter surface, resulting in inlet / outlet pressure differential between the occur. Coarse filter to remove larger particles in the water, making fine mesh to prevent damage by the large particles. Control Filters with differential pressure switches and integrated controller, when the pressure reaches the preset value, or pre-transfer recoil when the time interval, the controller into the backwashing process. Additional requirements in accordance with the user control system can increase other functions, the treatment machine fails to open bypass, off pump, or sound an alarm and so on. Self-cleaning In the pre-set pressure or the recoil when the interval of time taken to reach the sewage valve automatically opens, recoil proceedings. In the motor-driven recoil absorption fine-mesh surface rim screw rotation. The accumulation of impurities in the surface of the particle filter by recoil into the suction mouth, then through the sewage outflow valves. Recoil duration of about 40 seconds to 1 minute, Features Body kinds of compact, rugged and reliable Recoil water consumption, the required low water pressure Filtration of high precision, suitable for various types of water quality . Recoil when the pressure drop, without affecting the normal supply.