The invention relates to a device (1) for killing germs and/or pathogenic agents in a pumpable substrate, wherein the device (1) has at least one container (2) having a container cavity (4) for holding the pumpable substrate, which container cavity is surrounded by a container wall (3) of the container (2), wherein at least one dividing body (5) of the device (1), which can be moved, preferably slid, within the container cavity (4), is arranged in the container cavity (4), wherein the dividing body (5) divides the container cavity (4) into two partial volumes (6, 7) separated from each other for holding the pumpable substrate.