<![CDATA[ABSTRACT. This research focuses on determining the optimal doses of aluminum sulfate (Al₂(SO₄)₃) and soda ash (Na₂CO₃) in the water treatment process at the External Water Treatment Plant (EWTP). Improper use of chemicals can lead to waste and negative environmental impacts. Therefore, the jar test method was employed to evaluate the effect of various dose ratios on water quality parameters, including pH, Total Dissolved Solids (TDS), and turbidity. The study results indicate that the combined doses of alum and soda ash significantly impact all three water quality parameters. The optimal point is achieved at an alum:soda ash dose ratio of 1.24–1.26. This ratio provides the best balance between increasing pH, decreasing turbidity, and controlling TDS. Consequently, this research offers important recommendations for enhancing the efficiency and sustainability of the water treatment process. Keywords:Aluminum sulfate, Optimum dose, Water quality, Soda ash, Water treatment plant]]>
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