World demand for salt is about 260 million tonnes: https://en.wikipedia.org/wiki/List_of_countries_by_salt_production https://en.wikipedia.org/wiki/List_of_cou

World demand for salt is about 260 million tonnes: https://en.wikipedia.org/wiki/List_of_countries_by_salt_production https://en.wikipedia.org/wiki/List_of_countries_by_salt_prod... Seawater contains ~3% sodium chloride by mass: http://www.seafriends.org.nz/oceano/seawater.htm http://www.seafriends.org.nz/oceano/seawater.htm 2015 desalination rates of 86.8 million cubic meters per day would produce 950 million tonnes of sodium chloride per year (86.8 * 365 * 0.03): http://idadesal.org/desalination-101/desalination-by-the-numbers/ http://idadesal.org/desalination-101/desalination-by-the-num... Potential salt supplied from desal dwarfs demand. The excess, which is most of it, will be dumped.