Table salt purified into small, clean grains that are 97 to 99 percent sodium chloride; coarse salt keeps more impurities and bigger crystals. It usually has an anti-caking agent and may be iodized.
Most of the table salt sold in supermarkets has added iodine.
Tips
usage
In everyday speech people just say 盐. 精盐 is refined salt, purified to almost pure sodium chloride: ordinary table salt. 再制盐 is another word for refined salt.