A system for exchanging water for farming used in a factory aquafarm in accordance with an embodiment of the present invention, with respect to a biofloc type factory aquafarm having a plurality of farming tanks, comprises: farming tanks prepared in the shape of a cylinder; farm water suction ports formed in the side wall of the farming tanks and spaced from the bottom surface of the farming tanks by a height (h1) lower than 50% of a depth of the farming tanks; a precipitation tank receiving water for farming from the farming tanks and primarily settling the water for farming; a filtration tank receiving the relatively clean water in an upper part of the precipitation tank due to the precipitation of residual products and secondarily settling the water for farming; a first channel having one end connected to the farm water suction ports and the other end connected to the precipitation tank so as to supply the water for farming in the farm tanks to the precipitation tank; a second channel having one end connected to the precipitation tank and the other end connected to the filtration tank so as to supply the water for farming, of which the residual products has been primarily settled in the precipitation tank, to the filtration tank; and a third channel having one end arranged in water adjacent to the surface of the water in the filtration tank and the other end arranged in the upper part of the farming tanks from which the water for farming is blown down so as to supply the filtered water for farming to the farming tanks.
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