The invention relates to a container (1) comprising a cylindrical jacket (2), a lid (3) and a base (4), as well as a mounting ring and head ring (5, 6). The container is filled with a granular filling for the chemical and/or physical treatment of fluids (8) flowing through the interior of the container and is provided with at least one connection for the fluid inlet, one connection for the fluid outlet, one connection for ventilation and one connection for the bleeding of air. At least the fluid inlet (9), fluid outlet (10), ventilation (11) and air bleed (14) connections are positioned in the connecting part (22) of a central unit (19) which is mounted in a pressure-tight manner in a container connection (18) of the lid (3). The central unit (19) comprises the functional flow paths for the inlet of fluid (9.1, 9.2) into the region of the lid (3), the outlet of fluid (10.1, 10.2) from the region of the base (4), the input of ventilation air (11, 12) into the area of the base (4) and the air bleed (13, 14) connection for the air escaping from the region of the lid (3).