Do not increase the concentration by adding more hypochlorous acid effervescent tablets. Chlorine dioxide effervescent tablets are activated by water and release chlorine dioxide gas (ClO2). Chlorine dioxide gas is easily soluble in water and appears yellow-green. At the same time, some hypochlorous (HCLO) will be produced. Hypochlorous acid will ionize into hypochlorite ions (CLO-) and a small amount of chlorine (Cl2). Chlorine will react with water to produce hypochlorous acid (reversible reaction). Hypochlorous acid Adding more acid effervescent tablets will not increase the concentration.