... Mg, Cu and Fe; it is a fine agent for water treatment. Application:For industrial use, such as oil field, paper-making, ... industry, it is mainly used as a water softening agent in solution for printing, dyeing, and boiler; Diffusant in papermaking; ... analytical chemistry reagent. For food grade, it is mainly used as additive agent, PH adjusting agent and fermentation agent, and nourishment. Packaging ...