A container and a filtration assembly comprising a microscopy object carrier , a circular, film-type filter membrane having a circular diameter in the region of 25 mm and a thickness in the region of 10 μm, and a supporting body , wherein - said supporting body is arranged and/or formed in a recess on the front side of the carrier , - said filter membrane lies evenly on the supporting body , - said filtration assembly is configured to be placed over a top opening of the container such that the gap between the object carrier and the opening is air sealed, wherein the container is configured to receive a filtrate leaving the rear side of the carrier , said container is configured to lock into a predetermined position once placed in a rack of a pipette robot, wherein the rack provides a gas at pre-defined but adjustable pressure levels to the container and, thus, to the filtration assembly placed over the container, and provides support for one or more containers , each container comprising a container body, a bottom and a top , wherein the top opening matches the size and form of the filter membrane/supporting body of the object carrier which is placed over the opening for filtration of a sample and wherein the top provides a stable support for the filtration assembly holding it in a fixed, predetermined position, wherein the filtration assembly further comprises a heating device comprising: - a cylindrical ring ) that is placed with one of its openings concentrically over the filter membrane respectively, the supporting body of the filtration assembly, the ring defining a cylindrical closed wall, having a bottom opening and a top opening , wherein the bottom opening matches the size and form of the filter membrane and/or the supporting body , and - a lid that matches the size and form of the top opening of the ring ; - one or more heating elements selected from - a heating element which is integrated into the material of the ring , - a heating element which is arranged on the outer and/or inner surface of the wall defining the ring , and - a heating element arranged in or on the lid . - said supporting body is arranged and/or formed in a recess on the front side of the carrier , - said filter membrane lies evenly on the supporting body , - said filtration assembly is configured to be placed over a top opening of the container such that the gap between the object carrier and the opening is air sealed, wherein the container is configured to receive a filtrate leaving the rear side of the carrier , - a cylindrical ring ) that is placed with one of its openings concentrically over the filter membrane respectively, the supporting body of the filtration assembly, the ring defining a cylindrical closed wall, having a bottom opening and a top opening , wherein the bottom opening matches the size and form of the filter membrane and/or the supporting body , and - a lid that matches the size and form of the top opening of the ring ; - one or more heating elements selected from - a heating element which is integrated into the material of the ring , - a heating element which is arranged on the outer and/or inner surface of the wall defining the ring , and - a heating element arranged in or on the lid . - one or more heating elements selected from - a heating element which is integrated into the material of the ring , - a heating element which is arranged on the outer and/or inner surface of the wall defining the ring , and - a heating element arranged in or on the lid . <EOS>