... Ca, Ba, Mg, Cu and Fe; it is a fine agent for water treatment. 2>Sodium Hexametaphosphate's Technical Specifications: ... as additive agent, PH adjusting agent and fermentation agent, and nourishment;c) it is mainly used as a water softening agent in solution ... for printing, dyeing, and boiler; Diffusant in papermaking; slow corrodent, floating agent, dispersing ...