The water is highly mineralized water of estuaries and salt lakes, containing large amounts of salt (brine). By ion composition of brine lakes is divided into three classes: carbonate, sulfate and chloride. The concentration and composition of brine vary depending on the meteorological conditions at different times of the year and for several years. Thus, the concentration of brine mud lake resort Karachi decreased from 183 g/l in 1940 to 77 g/l in 1948 R. is used at mud cure resorts for bathing in the form of an independent course of thermal treatment, either in combination with mud cure. Cm. also Mud treatment.