A cleaning apparatus for cleaning filter screen, comprising: a suction chamber movably positioned adjacent a filter screen to be cleaned such that a first end of the suction chamber is positioned adjacent an inner surface of the filter screen and a second end of the suction chamber being coupled to a dirt collection conduit system for fluid communication with the dirt collection system, wherein an outer surface of the filter screen is arranged to be at a higher pressure than the dirt collection conduit system such that a pressure differential is arranged to be maintained between the outer surface of the filter screen and the dirt collection conduit system through the suction chamber; wherein the suction chamber comprises a central nozzle at the first end, characterized in that the central nozzle comprises a first portion with a constant cross sectional area and a second portion with a converging cross sectional area, wherein the first portion is proximal and adjacent to the first end of the suction chamber and the second portion is distal to the first end of the suction chamber, wherein a largest diameter of the central nozzle is lesser than an inner diameter of the suction chamber, the central nozzle and the suction chamber are arranged concentrically; and the suction chamber further comprises a plurality of peripheral suction nozzles arranged circularly in a circular clearance between the largest diameter of the nozzle and the inner diameter of the suction chamber, wherein a pressure differential between outer surface of the filter screen and the dirt collection conduit system facilitates movement of fluid from the outer surface of the filter screen to the dirt collection conduit system and wherein the fluid movement through the central nozzle of the suction chamber creates a low pressure regime around a mouth of the central nozzle inside the suction chamber, that facilitates fluid flow from the outer surface of the filter screen to rush towards the low pressure regime through the plurality of peripheral suction nozzles, thus removing retentate forcefully from the inner surface of the filter screen. a suction chamber movably positioned adjacent a filter screen to be cleaned such that a first end of the suction chamber is positioned adjacent an inner surface of the filter screen and a second end of the suction chamber being coupled to a dirt collection conduit system for fluid communication with the dirt collection system, wherein an outer surface of the filter screen is arranged to be at a higher pressure than the dirt collection conduit system such that a pressure differential is arranged to be maintained between the outer surface of the filter screen and the dirt collection conduit system through the suction chamber; the suction chamber comprises a central nozzle at the first end, characterized in that the central nozzle comprises a first portion with a constant cross sectional area and a second portion with a converging cross sectional area, wherein the first portion is proximal and adjacent to the first end of the suction chamber and the second portion is distal to the first end of the suction chamber, wherein a largest diameter of the central nozzle is lesser than an inner diameter of the suction chamber, the central nozzle and the suction chamber are arranged concentrically; and the suction chamber further comprises a plurality of peripheral suction nozzles arranged circularly in a circular clearance between the largest diameter of the nozzle and the inner diameter of the suction chamber, wherein a pressure differential between outer surface of the filter screen and the dirt collection conduit system facilitates movement of fluid from the outer surface of the filter screen to the dirt collection conduit system and wherein the fluid movement through the central nozzle of the suction chamber creates a low pressure regime around a mouth of the central nozzle inside the suction chamber, that facilitates fluid flow from the outer surface of the filter screen to rush towards the low pressure regime through the plurality of peripheral suction nozzles, thus removing retentate forcefully from the inner surface of the filter screen.