While food is historically known as one of the major uses for salt, the advent of chlorine and synthetic soda ash manufacture in the late nineteenth century and the use of salt for road deicing in the mid-twentieth century changed the importance of the food processing market.
Chemical manufacturing now is by far the largest outlet for salt, accounting for three-fifths of 2015 global consumption. Road deicing is the second largest share of world salt demand, followed by the food processing and livestock segments. Among other applications, water treatment and pharmaceutical manufacturing account for significant shares of salt consumption.