Sodium Tripolyphosphate Itis white powder; Easily soluble in water; It has got salient chelating capacity to ions of Ca and Mg etc. and can soften hard water Specification: Na5P3O10 94% min P2O5 57% min Non-Water Dissolvent 0.10% max Iron (Fe) 0.010% max pH(10g/L solution) 9.2-10.0 Whiteness(W10) 90%min