Abstract: A method of regulating water hardness for an aquatic recreational body of water by the steps of determining the water hardness, preferably determining the calcium ion content, and reducing the water hardness, preferably removing the calcium ions, based on a function of the determined water hardness and a target water hardness range using electrochemically assisted ion exchange technique. A system for regulating water hardness for an aquatic recreational body of water comprising a water hardness sensor, a water hardness reduction unit, and a control circuit in communication with the sensor and the water hardness reduction unit. Preferably the water hardness reduction unit uses an electrochemically assisted ion exchange process.

Abstract: An automatic system for monitoring chemistry information for a body of water comprises a sensor for determining chemistry information, a microprocessor for processing chemistry information, and a housing coupled to at least one of the sensor and the microprocessor. Preferably the housing is floatable or mountable. The method of providing chemistry information of a body of water comprising the steps of obtaining a sample of the body of water and determining chemistry information.