Cartridge (1) for coupling to a toilet flusher comprising at least one chamber (2) for receiving at least one free-flowing toilet cleaning preparation (6). The chamber (2) has an outlet (4) that lies in the direction of gravitation such that the toilet cleaning preparation can be released from the chamber (2) due to the force of gravity. The outlet (4) is, prior to a first coupling to the toilet flusher, secured prior to the release of the toilet cleaning preparation (6). The preparation is released from the cartridge (1) through the outlet due to the force of gravity when the cartridge (1) is first coupled to the toilet flusher. The chamber (2) has a communicating bar (8), wherein the bar and at least one other chamber (10) are designed so that they interact whereby the chamber (10) can be arranged on or next to the bar (8).