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In the seaweed processing industry to obtain quality products that are free of microorganisms, high concentrations of chlorine are used in the immersion process. Thus the wastewater from the immersion process still contains high concentrations of chlorine, where the wastewater when disposed of into the aquatic environment can cause pollution and environmental damage. The aim of the research is the reduction of high levels of chlorine in seaweed wastewater using a combination process of aeration, heating and addition of HCl. The experiment was carried out by adding wastewater from the seaweed immersion process with HCl (1, 2, 3, and 4% v/v), aerated at flowrate (1, 1.5, 2, and 2.5 liters/minute) and heated at temperature (35, 40, 45, and 50oC). The experimental results showed that the maximum reduction of chlorine by 99.4% was obtained by adding HCl by 4%, flowrate of 2.5 liters/minute and heating temperature of 50oC.