Shredding assembly for a grinder pump and centrifugal grinder pump

A shredding assembly for a grinder pump, comprising:

• a stationary shredding ring configured to be mounted to an inlet of the pump;
• and
• a cutting device configured to rotate about an axial direction and configured to be fixed to a shaft of the pump,
• the shredding ring comprising a top face, a bottom face, and a central opening extending from the top face to the bottom face and being delimited in a radial direction by an inner periphery, a plurality of slots extending in the axial direction formed in the inner periphery,
• the cutting device being positioned in the central opening of the shredding ring, and comprising a front face and a back face, the front face comprising a plurality of first cutting members extending in the axial direction and facing the plurality of slots in the inner periphery, the back face of the cutting device comprising exactly two second cutting members projecting beyond the central opening with respect to the radial direction, the exactly two second cutting members being arranged diametrically opposite at an outer periphery of the cutting device.