Water treatment of hydrotherapy exercise pools. Author: Edlich RF; Becker DG; Phung D; McClelland WA; Day SG Address: Department of Plastic Surgery, University of Virginia School of Medicine, Charlottesville 22908. Source: J Burn Care Rehabil, 1988 Sep-Oct, 9:5, 510-5 Abstract: The major objectives of water treatment of hydrotherapy pools are to disinfect the water and to balance the water appropriately. A variety of disinfectant systems utilizing either halogens, ozone, or metals have been implemented in hydrotherapy pools. Regardless of the disinfectant system employed, continual and appropriate monitoring of the system is mandatory to prevent infection. Water balancing refers to the control of the water mineral concentration so that the water does not damage the pool. Five major factors that influence water balance are pH, total alkalinity, calcium hardness, total dissolved solids, and temperature. The extent to which these five factors affect water balance can be computed by the Langelier saturation index.