Patent ID: 8821720

Claim:
A filtering apparatus for treating ballast water, comprising: a housing having an inlet and an outlet which permits inflow and outflow of the ballast water; a filter filtering the ballast water which flows in the housing; and an automatic washing unit washing away foreign substances adhering to the filter; wherein the automatic washing unit comprises: a driving unit driving the automatic washing unit in response to a signal of the control unit; a suction unit movably connected to the driving unit to suck the foreign substances adhering to the filter; and an exhaust unit exhausting the foreign substances sucked by the suction unit; and the housing is constructed so that a housing cover plate coupled to an end of a housing body is removably coupled to the exhaust unit, thus enabling easy assembly, disassembly and maintenance; and the exhaust unit comprises a base flange on an end thereof which is coupled to the housing cover plate, and the base flange comprises a projecting step which projects to be inserted into a core through hole formed in the housing cover plate, so that the exhaust unit is precisely and easily coupled to the housing cover plate using the core through hole formed in the housing cover plate.