The depleted brine contains free chlorine, hypochlorous acid and chlorates, as result of electrolysis parasitic reactions. This is the reason why it is fed to a post-electrolysis brine treatment section.

Free chlorine elimination (dechlorination) occurs in a two stages. In the first stage, the feed of HCl in strong vacuum conditions drastically removes the free chlorine. In the second stage the bi-sulphite addiction eliminates the free chlorine residual traces.

The chlorate destruction is managed in a FRP reactor having a proprietary unique design, special thicknesses and resin adopted, to provide efficiency and long lifetime. The further addiction of HCl together with the high temperature, destroys a large percentage of chlorate in an important amount of the main brine flow.