PH:15.5-19 can be used to soft water SpecificationspecificationsTech. gradeAppearanceWhite crystalsMain content, % min98.0Phosphorus pent-oxide, % min18.3Sodium oxide,asNa2O. .15.5-19Water insoluble, % max0.1Heavy metals, as Pb. % max-----Arsenic,as As. % max-----Fluoride,as F. % max-----Sulfate,as SO4 % max0.5Chloride,as Cl. % max1.5 High Purity Trisodium phosphate