Laizhou changhe chemical co. Ltd. Is located near Laizhou bay, the bank of bohai, enjoying convenient transportation. The annual output of magnesium series is 30,000 tons. Magnesium series include: Magnesium sulfate(anhydrous, monohydrate, dihydrate, trihydrate, pentahydrate, heptahydrate), large, middle and small particle, agriculture-grade, industry-grade, medicine and food-grade, feed- grade;magnesium monohydrate fertilizer etc..