... solvent compound with metallic ions such as Ca, Ba, Mg, Cu and Fe; it is a fine agent for water treatment. 2 ... insoluble %≤0.050.063> Sodium Hexametaphosphate's Application:a) For industrial use, such as oil field, paper-making, textile, dyeing, petrochemical industry ... and fermentation agent, and nourishment;c) it is mainly used as a water softening agent in solution for printing, dyeing, and boiler ...