The invention relates to a floor treatment system, comprising a mobile floor treatment apparatus and a docking station therefor, wherein the floor treatment apparatus has at least one liquid container with a container wall and a container interior, wherein the docking station comprises at least one supply conduit through which, in a docked position of the floor treatment apparatus on the docking station, a liquid is suppliable to the container interior, wherein the floor treatment system comprises an opening device by way of which a wall portion of the container wall is movable into an open position, for clearing at least one container opening of the at least one liquid container, and in the docked position of the floor treatment apparatus the liquid can exit from the container interior through the container opening, and wherein the wall portion is transferable into the open position by the opening device by moving the floor treatment apparatus from a non-docked position into the docked position.