During the past 10 years, water suppliers in Florida have installed some 85 desalting treatment plants, most of which use reverse osmosis. The usual application for treating brackish groundwater in heavily populated coastal areas has been shallow groundwater resources, which are presently used to their ultimate potential. Alternative methods for desalting water include flash distillation and electrodialysis plants; however, reverse osmosis has proven to be the most satisfactory and widespread technique for development of potable water. These techniques for treating alternative sources of water are also being considered for waste treatment and for removal of organics. Includes table, figure.