A liquid dispenser employs passive driving force resulting from water level variations in the water tank of a toilet to dispense a quantitative amount of liquid into toilet bowl of each Flush is disclosed. The present invention separates the pinion actuator solenoid from the starter motor power switching circuit. Additionally provided herein are methods for introducing transgenes into inbred corn line KLI6131, and plants produced according to these methods. A second user may request to share the sample bag from a second user and the sample bag is then communicated to the second user for viewing and sharing. According to the invention the dose setting mechanism allows adjustment in both directions, such that a given set dose can be reduced or cancelled by reversing the input motion, typically by rotating a setting member backwardly, this in contrast to the known devices which either requires an additional release mechanism or which cannot be reversed at all.