Dead Sea 342 parts per thousand (in 2002), and a temperature that swung between and . Underneath a zone of transition, the lowest level of the Dead Sea had waters of a consistent temperature and complete saturation of sodium chloride (NaCl). Since the water near the bottom is saturated, the salt precipitates out of solution onto the sea floor. Beginning in the 1960s, water inflow to the Dead Sea from the Jordan River was reduced as a result of large-scale irrigation and generally low rainfall. By 1975, the upper water layer was saltier than the lower layer. Nevertheless, the upper layer remained
Dead Sea salt minerals and salts. Major ion concentrations in the water of the Dead Sea have given the following results (which do not necessarily reflect those of Dead Sea "salt"): The major minerals present in Dead Sea mud—the result of runoff streams flowing into the Dead Sea and bringing large deposits during the Holocene era—have been shown to be the following: Dead Sea salts have been claimed to treat the following conditions: "Rheumatologic Conditions" – in balneotherapy of rheumatoid arthritis, psoriatic arthritis, and osteoarthritis. The minerals are absorbed while soaking, stimulating blood circulation. "Common skin ailments" – for treating skin disorders such