TurboWitt The TurboWitt C20 is a cylindrical sieve mill. Having a rotating sieve drum; it is well-suited for homogenizing and control-sieving granular products to a fineness down to 150 µm. Its rotating sieve drum brings substantial benefits. The centrifugal forces acting on the product and the two changeable stator arms gently and very efficiently convey the product through the sieve opening. Its compact and modular design allows easy integration in nearly all process flows.