The electrolysis of industrial wastewater containing wet dyes was investigated using both a communal cell and a porous diaphragm-based continuous flow reactor equipped with Platinum (Pt) as Anode and Stainless steel (SS) Cathode Electrodes. The study focused on evaluating colour removal and Chemical Oxygen Demand (COD) reductions by electrochemically produced Oxidizing agent Cl2(g). Key operational parameters including current density, sodium chloride (NaCl) concentration, pH, electrolysis time, retention time, and solution flow rate were systematically varied to determine their effects on treatment efficiency. The optimum conditions were identified as a NaCl concentration of 40 g/L, current density of 200 mA, initial pH 5, retention time of 72 h, electrolysis time of 60 min, and a flow rate of 2.67 mL/min. Under these conditions, the system achieved 99.97% color removal and 99.97% COD reduction, lowering COD levels from an initial 89,090 mg/L to 22.67 mg/L. The high efficiency was attributed to enhanced hypochlorite generation and improved mass transfer facilitated by the porous diaphragm and optimal flow regime. The novel reactor configuration enabled effective oxidation without secondary sludge formation, offering a cost-effective, scalable, and eco-friendly solution for textile dye wastewater treatment. This study underscores the potential of electrochemical techniques using durable electrode materials for industrial effluent remediation in compliance with stringent environmental standards.