We have very strong advantageous in Magnesium Sulphate Heptahydrate. we have 3 kinds of MgSO4 as follows: MgSO4.7H2O with drying just like free-flowing sand, MgSO4.7H2O without drying just like sugar, another is big granular based on 1-4mm, Components: Guaranteed Analysis Typical Analysis: Main Content: 98% min99.2% Ferron(Fe): 0.005% max ≤0.002%Chloride(Cl): 0.3% max ≤0.014% Heavy metal(Pb): 0.001% max ≤0.001%Arsenic(As): 0.0002% max ≤0.0001% More detailed information or questions, please kindly contact us! ---------------------------------------------------------------------------------------------- -We Finished Pre-Registration As Per Reach With 19 Kinds Of Chemicals. -We Have Already Obtained Certificate of "Fami-Qs" Through Bv. -We Have Already Obtained Certificate of "ISO9001:2008" Through SGS ----------------------------------------------------------------------------------------------