Can’t those waste products be utilized? There are specialty salts from all over the world advertised in a spice catalog I receive. Just make salt!
I think those waste products can be used.
So many places use salt on the road in the winter to help melt ice and snow. Desal plants could sell these stashes of salt to places which need them for that.
I’ve seen sea salt in the supermarket. Is that literally natural salt from the sea? If it is, then the salt from desal plants could be sold to supermarket chains to sell to consumers.