This study aims to apply electrochemical technique to produce free chlorine from brine which located at the desalination plant in western Tripoli. Therefore, maximizing benefits and reducing negative effects. Two variables were studied: electrical voltage, and the distance between electrodes, using a dimensionally stable titanium anode (DSA) coated with a layer of ruthenium oxides (RuO2), and a graphite cathode, the applied voltages were 3.5 V, 4.5 V, and 5.5 V. While the inter-electrode distances were 1.0 cm, 1.4 cm, 2.0 cm, and 2.8 cm. Along with measuring the free chlorine concentration (in ppm) during different running times up to 100 min. The findings indicated that raising the electrical voltage increases chlorine production rate, where highest concentration reached 582.2 ppm at 5.0 V and 1.0 cm after 100 mi. Results indicated that controlling distance and electrical voltage plays a major role enhancing the electrochemical cells performance to produce chlorine efficiently. This scientific manuscript was presented at the sessions of the International Renewable Energy, Oil, Gas, and Climate Change Conference "iREGO", in the period of April 25–27, 2026. Tripoli, Libya............... Keywords: .....................Brine, Free Chlorine, Electrolysis, DSA Anode (RuO₂/TiO₂), Applied Voltage, Electrode Distance.