be seen in fig5 the first screen 58 has formed onto it centrally and thus coaxially in relation to the filling opening 34 and in relation to the filling nozzle 40 a connection nozzle 60 which carries a cutting edge 64 and a second screen 66 at its free end 62 which is directed toward the accommodating well 30 the mesh width of the second screen 66 is likewise approximately 1 mm the second screen 66 can be seen in particular from fig5 the trough periphery 54 of the insert 52 encloses a stepped trough base 68 which outside the central depression 56 has two discharge nipples 69 70 which each engage through a respective tap off opening 71 72 of the accommodating well 30 each tap off opening being formed in the well base 32 such that it is offset laterally in relation to the filling opening 34 a refill container 75 which can be handled on a stand alone basis and is illustrated separately in fig6 and 7 is inserted in an upended state into the accommodating well 30 this refill container is substantially rectangulate and has a container base 76 and a container top 77 which are connected integrally to one another via a container wall 78 in a manner corresponding to the accommodating well 30 the refill container 75 is substantially rectangular in cross section it can be inserted into the accommodating well 30 to establish a positive lock this is evident in particular from fig3 in the.