The invention relates to a device having a centrifugal pump and a comminuting assembly. The comminuting assembly is arranged upstream of an impeller (8). The comminuting assembly comprises a rotatingelement (13) and a stationary element (15). The comminuting assembly is used for the comminution of solid admixtures present in a conveying medium. The stationary element (15) has an outer part (20) and an inner part (21), the outer part (20) at least partially surrounding the inner part (21).