Aquarium Coral marine reef sea salt 1)Rich in Ca,Mg,Sr, etc 2)Fast dissolving. 3)Phosphate-free 4)Nitrate-free 20KG Aquarium marine Coral Reef Sea Salt1)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)The marine salt dissolving rapidly, so that can make ...