Abstract: A reservoir management system for a water reservoir having inlet and outlet piping and means for adding chemicals in controlled amounts to the water within the reservoir. One or more eductors are positioned within the water reservoir to mix and circulate water within the reservoir. A recirculating pump is located externally to the reservoir and has an inlet line that taps into the outlet piping from the reservoir. One or more sample lines remove test streams of water from the reservoir which are analyzed to determine the level of at least one of chemical in the test stream to provide a chemical-related signal. A controller receives the signal and compares the signal to a set point indicative of the level of chemical desired within the reservoir to maintain, increase, or decrease the amount of chemical added to the water within the reservoir in controlled amounts.