See the benefits of natural chlorine with Saltron Retro—a salt-chlorine generator for in-ground and above ground swimming pools. No more harsh chemicals in your pool! Saltron Retro is a self-contained purification system that utilizes a natural process to generate pure chlorine. The electrolytic process uses a very low concentration of salt (less than a teaspoon per gallon) and generates free chlorine. The chlorine continuously kills bacteria and algae and then reverts back to salt. This indefinite cycle leaves the water feeling silky, soft, refreshing and sparkling clear.