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1. A device for separating solid materials from liquids or gases, comprising a pressure vessel, having at least one inlet nozzle for an inlet connection, at least one filtrate discharge nozzle for a filtrate discharge connection, and a plurality of filter elements, wherein the filter elements are arranged side by side and parallel next to one another and are connected to one another to form a filter package, wherein there is a free space between the individual filter elements over a large part of their vertical longitudinal extension, and wherein the filter elements are arranged in a flexible container which is arranged in the pressure vessel and is sealed tightly relative thereto, wherein the pressure vessel comprises at least one outlet for the discharge of solid material and the flexible container comprises at least one discharge connection, wherein each said at least one discharge connection of the flexible container is guided through a corresponding outlet of the pressure vessel and is sealed tightly relative to the pressure vessel, wherein the outlet and said at least one discharge connection of the flexible container can be sealed tightly relative to an environment outside the flexible container and the pressure vessel by means of a closure mechanism, wherein the filter elements are arranged in a suspended position and are designed in such a way that they can be pressed together to empty the flexible container, wherein a sealed pressure vessel zone is located inside the pressure vessel between an inner wall of the pressure vessel and an outer wall of the flexible container, and wherein a pressure line is attached to the pressure vessel in order to introduce an overpressure in the pressure vessel zone inside the pressure vessel in order to compress the flexible container and to compress the filter elements in the flexible container.
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