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This paper presents the results of PAC synthesis from aluminum factory waste. PAC was synthesized under the following conditions: HCl 18%, reaction temperature of 70 °C, reaction time of 15 minutes for AlCl3 formation reaction; NaOH 6M, pH of 5, reaction temperature of 25 °C, and reaction time of 30 minutes for PAC synthesis from AlCl3. The synthesized PAC meets technical requirements, with an aluminum content of approximately 13%. The surface water treatment efficiency using PAC synthesized from aluminum factory waste is quite good, with turbidity notably reducing from 13NTU to 1.8NTU, meeting current Vietnam Quality Standards requirements.