The waste gas cleaning facility of a chemical production process incurs high costs due to technical problems that occur during operation. This contribution describes the approach, where by a systematic analysis and improvement, a strategy is designed that enables the facility to concentrate on performing its primary function: waste gas cleaning. As a positive effect in resource efficiency, the pollutant halogenated hydrocarbon that is present in the examined process circuit is completely returned as feedstock into the production process, dramatically reducing feedstock consumption and associated costs; the process becomes, at this location, emission-free.