Sea salt is formed from the natural evaporation of ocean water, generally in man-made pools near a protected shoreline. Sea salt is 98% sodium chloride, compared to table salt's 99.9% purity. The remaining 2 percent can be trace minerals such as iron, magnesium, sulfur or iodine. Unlike table salt, which is mined from land-based sources, natural sea salt does not contain added sugar, anti-caking ingredients or potassium iodide. Sea salt is also considered Kosher, which means it has been approved by rabbis for use by observant Jews.