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 (1111, 1301) 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 (1108, 1303); characterized in that: the auger is partially disposed in a tube (1110, 1304) 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 (1111, 1301) 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 (1108, 1303); characterized in that: the auger is partially disposed in a tube (1110, 1304) 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 (1110, 1304) 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.