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The formation ways of active chlorine, chlorite, chlorate and perchlorate results from electrochemical and chemicals reactions in electrolysis system that shown equations from (1) to (14)[10]. In electrolysis process by Adept Electrochemical Technology, the active chlorine formation is dependence on flow rate and current and initial chloride concentration. The produced active chlorine concentration is increase when current and initial chloride increase but active chlorine is decrease as flow rate increase and reach to highest at 500ml/min. If phenol and DOC presence in sodium chloride electrolyte, produced active chlorine were decrease as phenol and TOC concentration increase. The results show that acetate is not effect to the formation of active chlorine in electrolysis sodium chloride by Adept Electrochemical Technology.