Abstract: A device (1) for preparing a substance suspension, in particular a pulp suspension, with a container (2), with stator sheets (30) provided in the interior of the container and designed as baffles, and with a rotor (4) in the container, on which rotor a dispersing disk (8) is provided, includes an annular displacement element (20) provided in the interior of the container (2), an element whose outside surface (22) is some distance from the inside surface (23) of the wall (24) of the container (2). The inner opening (21) of the displacement element (20) that is arranged coaxially to the rotor is hopper-like, whereby the expanded area of the opening points to the cover (3) of the container (2). The stator sheets provided in the container span the channel (25) between the exterior (22) of the displacement element (20) and the interior (23) of the wall (24) of the container.