Abstract: Disclosed are a backwashing fluid discharge apparatus and a filter unit. The backwashing fluid discharge apparatus includes a plurality of drainage members installed so as to be located within a filter member in order to discharge backwash fluid moved to an inside of the filter member, and the drainage members have different diameters so as to form a plurality of inlet holes for introduction of the backwash fluid, and the drainage members have different lengths such that the inlet holes are located at different heights.

Abstract: Disclosed is a filter device. The filter device includes a filter housing including an inflow port, through which ballast water flows in, and an outflow port through which the ballast water flows out, a plurality of filter members provided in the filter housing to filter out a foreign substance included in the ballast water, and a backwashing unit coupled to at least one of the plurality of filter members to filter out the foreign substance by using a difference internal pressure and atmospheric pressure. The backwashing unit is provided for the ballast water to flow in so that when it is required for the backwashing unit to remove the foreign substance, at least one of the plurality of filter members coupled to the backwashing unit filters out the foreign substance included in the ballast water.

Abstract: Disclosed is a filter device. The filter device includes a filter housing including an inflow port through which water flows in and an outflow port through which the water flowed in through the inflow port flows out, a plurality of filter members installed in the filter housing, an inflow unit installed in the filter housing and provided in each of both sides of each of the plurality of filter members for the water flowed in from the inflow port to be supplied to a plurality of openings respectively provided in the both sides of each of the plurality of filter members, and a backwashing unit coupled to both sides of at least one of the plurality of filter members for foreign substances filtered out by the plurality of filter members to be backwashed from the plurality of filter members. The plurality of filter members each has a hollow form to filter the water flowed in from the inflow port.

Abstract: Disclosed is a filter device. The filter device includes a filter housing including an inflow port, through which ballast water flows in, and an outflow port through which the ballast water flows out, a plurality of filter members provided in the filter housing to filter out a foreign substance included in the ballast water, and a backwashing unit coupled to at least one of the plurality of filter members to filter out the foreign substance by using a difference internal pressure and atmospheric pressure. The backwashing unit is provided for the ballast water to flow in so that when it is required for the backwashing unit to remove the foreign substance, at least one of the plurality of filter members coupled to the backwashing unit filters out the foreign substance included in the ballast water.

Abstract: Disclosed are a backwashing fluid discharge apparatus and a filter unit. The backwashing fluid discharge apparatus includes a plurality of drainage members installed so as to be located within a filter member in order to discharge backwash fluid moved to an inside of the filter member, and the drainage members have different diameters so as to form a plurality of inlet holes for introduction of the backwash fluid, and the drainage members have different lengths such that the inlet holes are located at different heights.