ABSTRACT The dechlorination process in the brine tank is a process to remove the remaining chlorine dissolved in the weak brine solution using sulfur dioxide (SO2) as a reductant. SO2 solution is a solution formed when sulfur dioxide gas (SO₂) dissolves in water (H₂O), colorless with a pungent odor. Concentration is the amount of a solute in a homogeneous mixture (solution). The methods us…