1)Food grade 1)Rich in macroelments and microelements 2)For corals,ornamental fish Aquarium Synthetic Sea Salt 20KG Box 1)Synthetic Sea-Water Salt absolutely does not contain any harmful material and element such as nitrate(NO3), phosphate(PO4), silicate(Si),beryllium(Be), osmium(Os) and thallium(TI), etc..2)Our product has a strict control system in the process of producing to make marine salt ...