A water quality management system for a water installation containing water, the system comprising: a water quality measurement module adapted to monitor the water quality of the water in the water installation and to send water quality information to a controller; and a chemical dispensing module adapted to dispense at least one chemical directly into the water installation in response to signals from the controller based on a water quality measurement by the water quality measurement module, the chemical dispensing module comprising: a reservoir adapted to contain the at least one chemical, a movable dispenser adapted and configured to advance a fixed quantity of the chemical out of the reservoir into the water of the water installation in response to signals from the controller, wherein the movable dispenser is an auger ; characterized in that : the auger is partially disposed in a tube extending to an exit port of the reservoir and partially disposed in the reservoir above the tube; a flexible sleeve extends from the tube, the flexible sleeve having an open configuration in which chemical is permitted to flow from the tube into the water installation and a closed configuration in which the flexible sleeve seals the exit port of the reservoir; and the system further comprises an actuator for moving the flexible sleeve from the open configuration to the closed configuration. a water quality measurement module adapted to monitor the water quality of the water in the water installation and to send water quality information to a controller; and a chemical dispensing module adapted to dispense at least one chemical directly into the water installation in response to signals from the controller based on a water quality measurement by the water quality measurement module, the chemical dispensing module comprising: a reservoir adapted to contain the at least one chemical, a movable dispenser adapted and configured to advance a fixed quantity of the chemical out of the reservoir into the water of the water installation in response to signals from the controller, wherein the movable dispenser is an auger ; characterized in that : the auger is partially disposed in a tube extending to an exit port of the reservoir and partially disposed in the reservoir above the tube; a flexible sleeve extends from the tube, the flexible sleeve having an open configuration in which chemical is permitted to flow from the tube into the water installation and a closed configuration in which the flexible sleeve seals the exit port of the reservoir; and the system further comprises an actuator for moving the flexible sleeve from the open configuration to the closed configuration. the auger is partially disposed in a tube extending to an exit port of the reservoir and partially disposed in the reservoir above the tube; a flexible sleeve extends from the tube, the flexible sleeve having an open configuration in which chemical is permitted to flow from the tube into the water installation and a closed configuration in which the flexible sleeve seals the exit port of the reservoir; and the system further comprises an actuator for moving the flexible sleeve from the open configuration to the closed configuration. <EOS>