I don't know much about Gose, but salt I know. You don't want iodine or anti caking agents, just pure salt. And despite the histrionics of foodies, no matter the source, when it gets to you salt is salt is salt. NaCl. The only difference is crystal size and shape. This may be of aesthetic importance in some applications, but you just want a pure, fine crystal that dissolves readily. That's what pickling salt is.