People are considering using salt as a building material now: https://www.archdaily.com/994769/could-salt-be-a-material-of-the-future-innovating-with-crystalli

People are considering using salt as a building material now: https://www.archdaily.com/994769/could-salt-be-a-material-of-the-future-innovating-with-crystallized-salt-panels https://www.archdaily.com/994769/could-salt-be-a-material-of... When you have a practically free resource which is waste from a large scale industrial process, cottage industries to make use of the free waste sometimes pop up. It's a solvable problem.