The Product has been approved by ISO9001:2000, GB/T19001-2000 Quality management system certificate high quality with best price Magnesium Sulphate/ Natural KieseriteSpec.: Water MgO: 23%min S: 16%min Moisture: 2%maxSize: 0-2mm, 90%minPack.: In 50kgs/wpp bag 100% Natural Kieserit Powder, 100% Soluble in Water, Non-Chemical Additives, MgO: 25-26% , This fertilizer was produced from sea water, ...