... ,Mg,Cu and Fe;It is a fine agent for water treatment.Specification: itemsIndustrial gradeFood gradeTotal phosphate (P2O5)68 ... , it is mainly used as a water softening agent in solution for printing, dyeing, and boiler; Diffusant in ... of in the open air,kept away from water,moisture and sunlight during transport,handled with care ... poisonous. HOT SALE! --Sodium Hexametaphosphate 68% for water treatment