Cross- flow method using a large integer constant external pressure device and this way the ultrafiltration membrane module with the start of the scheme the . Feed water storage tank for storing the water supply for the water purification device with an ultrafiltration membrane module, water treatment ; Discharged by transmitting a portion of the feed water introduced from the feed water tank from the outside to the inside of the hollow fiber membrane mounted in the ultrafiltration membrane module, and passing the remaining feed in a cross flow along the outer surface of the hollow fiber ultrafiltration membrane module; Permeate water tank for storing water permeated discharged from the interior of the hollow fiber membrane ; And a concentrated water transfer line for feeding back the concentrated water that has passed through a cross flow along the outer surface of the hollow fiber membrane to the feed water storage tank .
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