Most foods have sodium in them. The commonest form is sodium chloride, found in desk salt. Your system loses a certain level of sodium daily through sweat and when you drop by the bathroom. Molecular dehydration of mono- and disodium phosphates, or managed calcination of sodium orthophosphate mixture from sodium https://www.tjcyindustrialchem.com/news/what-is-sodium-tripolyphosphate-stpp-used-for.html