A washing device comprising at least one body; at least one drum located in the body, in which cleaning and spinning processes are carried out; at least one front wall which is located in the body and has at least one placement opening for access to the drum; at least one drain pump located in the body for removing the cleaning liquid in the drum by means of at least one discharge line out of the drum when a cleaning process is completed and/or during a spinning process; at least one circulation pump for circulating the water in the drum during a cleaning process, which is in fluid communication with the drum by means of at least a first outlet line; at least one filter assembly which is located in the body and comprises: - at least one filter body in the form of a hollow chamber, having a first side that is open, and an outlet opening on a second side opposite to the first side, wherein said drain pump is located on the second side thereof such that it is in fluid communication via the outlet opening, and wherein the filter body comprises • at least a first inlet through which fluid communication is provided with the drum via at least one main inlet line, • at least a first outlet in communication with the discharge line, through which the cleaning liquid received from the first inlet exits during operation of the drain pump, • at least a second outlet through which the cleaning liquid received from the first inlet exits during operation of the circulation pump, and through which fluid communication is provided with the circulation pump via at least a first inlet line characterized in that the filter assembly further comprises at least one microfiber filter located in the filter body, which filters the cleaning liquid received into the filter body through the first inlet so as to retain microfiber particles and which comprises • at least one filter retainer in a hollow form, which has more than one filter hole thereon, which is open at both ends in order to effectively clean the accumulated fluff inside, and which comprises at least one front cover to cover the end close to the filter inlet and at least one rear cover to cover the end farther from the filter inlet, wherein the rear cover is in the form of a ring and comprises at least one filtering element covering the middle part thereof having an opening; • at least one filter inlet located in the filter retainer so as to correspond to the first inlet; and • a plurality of filtering elements located in the filter retainer to cover the filter holes and performing the filtering process including microfiber particles. - at least one filter body in the form of a hollow chamber, having a first side that is open, and an outlet opening on a second side opposite to the first side, wherein said drain pump is located on the second side thereof such that it is in fluid communication via the outlet opening, and wherein the filter body comprises • at least a first inlet through which fluid communication is provided with the drum via at least one main inlet line, • at least a first outlet in communication with the discharge line, through which the cleaning liquid received from the first inlet exits during operation of the drain pump, • at least a second outlet through which the cleaning liquid received from the first inlet exits during operation of the circulation pump, and through which fluid communication is provided with the circulation pump via at least a first inlet line • at least a first inlet through which fluid communication is provided with the drum via at least one main inlet line, • at least a first outlet in communication with the discharge line, through which the cleaning liquid received from the first inlet exits during operation of the drain pump, • at least a second outlet through which the cleaning liquid received from the first inlet exits during operation of the circulation pump, and through which fluid communication is provided with the circulation pump via at least a first inlet line • at least one filter retainer in a hollow form, which has more than one filter hole thereon, which is open at both ends in order to effectively clean the accumulated fluff inside, and which comprises at least one front cover to cover the end close to the filter inlet and at least one rear cover to cover the end farther from the filter inlet, wherein the rear cover is in the form of a ring and comprises at least one filtering element covering the middle part thereof having an opening; • at least one filter inlet located in the filter retainer so as to correspond to the first inlet; and • a plurality of filtering elements located in the filter retainer to cover the filter holes and performing the filtering process including microfiber particles.