Selena from Huakang Magnesium Sulphate Co.,Ltd,producing Magnesium Sulphate Heptahydrate, Monohydrate and Anhydrous,and magneisum oxide,kieserite.Kindly help to introduce to your purchasing department .Or help sending their email address to me.Email:[email protected] or [email protected]. Skype:selenahk888.Tel: 86-13355361726 Thank you very much.