Once in Chemistry class, I threw the wrong layer away and proceeded to crystalize the layer I saved. It made the wrong shaped crystal. Yep, I made salt instead of whatever it was supposed to be. So removing salt that way can be done with a little bit of chemistry know how. But, really just easier to make a new batch of soup! or try the diluting thing with adding extra ingredients except no more salt? Oh and I passed the chemistry class because the teacher thought I had done an OK job of figuring out my mistake.