a way which is generally known the accept outlet is marked with reference number 7 the reject is removed through a reject outlet 8 in fig2 those devices or parts of devices that are identical to the configuration which is state of the art and shown in fig1 are marked with the same reference numbers in the preferred configuration of a screen according to the invention and as shown in fig2 the screen 1 consists of three separation units 1 u2032 1 u2033 and 1 u2032 u2033 the three separation units 1 u2032 1 u2033 and 1 u2032 u2033 have one common rotor whose sections 4 u2032 4 u2033 and 4 u2032 u2033 respectively adapted to the flow conditions in the corresponding separation unit are parabolic or have the shape of a truncated paraboloid as an alternative the sections of the rotor can also be shaped similar to a truncated cone or a parabola each separation unit has a reject outlet 9 u2032 9 u2033 and 9 u2032 u2033 the reject from the first and second separation units is thus also the feed to the next separation unit in each case the reject from the third and final separation unit is drawn off through the reject outlet 8 in fig2 a pipe for dilution water mounted inside the rotor is marked 10 and the outlets from the pipe will be described in more detail below a deflaking unit 13 is provided at the transition from the second to the third separation unit 0050 fig3 and 4 show preferred configurations of a reject outlet in this case reject outlet 9 u2032 in an enlargement of the section marked.