Aquarium Coral marine reef sea salt 1)Rich in Ca,Mg,Sr, ... dissolving. 3)Phosphate-free 4)Nitrate-free 20KG Aquarium marine Coral Reef Sea Salt1)Synthetic Sea-Water Salt absolutely does ... (NO3), phosphate(PO4), silicate(Si),beryllium(Be), osmium(Os) and thallium(TI), etc.. 2)The marine salt dissolving rapidly, so that ... same properties as the natural sea water.. 20KG Aquarium marine Coral Reef Sea Salt