... supply,competitive price 1-Hydroxyethylidene-1,1-Diphosphonic acid(HEDP)Specification:Specification:60% liquidAppearanceWhite to pale yellow liquidAcid60 ... (Fe)35 ppm maxColor80 Hazen max90% powderAppearanceWhite crystalline powderAcid90%Phosphorous acid2.5% maxPhosphoric acid0.7% maxPH(1% solution) ... treatment process. 1-Hydroxyethylidene-1,1-Diphosphonic acid(HEDP),Reach registered, powder, liquid