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Both are present as their calcium and magnesium salts because Salifert's research has shown that iodate is complexed with calcium and magnesium in NSW. Salifert Natural Iodine 500ml. Iodine is present in Natural Sea Water (NSW) in a very low concentration (0.06 mg/l or 0.06 ppm) and occurs as iodide, iodate, molecular iodine and hypoiodite.