The “new cruse” and the “salt” are evidently chosen from a regard to symbolizm. The foul stream represents sin, and to cleanse it emblems of purity must he taken. Hence, the clean “new” dish previously unused, and thus untainted; and the salt, a common Scriptural symbol of incorruption (see Leviticus 2:13; Ezekiel 43:24; Matthew 5:13, etc.).
Related Commentaries of 2 Kings 2:20
2 Kings 2:20
20 And he said, Bring me a new cruse, and put salt therein. And they brought it to him.