... ,Mg,Cu and Fe;It is a fine agent for water treatment.Specification: itemsIndustrial gradeFood gradeTotal phosphate (P2O5)68% min68% ... and building material industry, it is mainly used as a water softening agent in solution for printing, dyeing, and boiler; ... plastic bags.Furthermore,is should be stored separately from poisonous. HOT SALE! --Sodium Hexametaphosphate 68% for water treatment