The invention relates to a flushing water guiding arrangement (1) for a toilet bowl (5) or similar, comprising a housing which can be inserted into the edge (4) of the toilet bowl, an inlet (6), at least one outlet (7, 8, 10) and a dispensing device (11) which is used to dispense at least one liquid active substance as a supplement to the flushing water. The dispensing device (11) comprises at least one container (12) which is used to receive the active substance and at least one dispensing opening (13) which is arranged between the inlet (6) and the outlet (J, 8, 10). The flushing water guiding arrangement is characterized in that low pressure is set in the container (12) when the active substance is dispensed and that, essentially, only air reaches into the container (12) which is suctioned by the low pressure in the container (12).