Pontenossa S.p.A. reports that in November 2011 important maintenance work was carried out on the Waelz plant. This mainly concerns intervention on the gas lines found on the exposed side of the furnace. Part of the air/gas exchangers have been replaced and improved, two intermediate sections of the conduit tube have been rebuilt and the filling shells of the post-combustion reaction towers have been changed. Furthermore, other routine interventions have been undertaken, the most important of which has been the replacement of approximately 13 meters of refractory coating to the furnace. After restarting the production process, the modifications proved to be effective with greater improvement in performance compared to previous experiences.