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• The maximum allowable WHO value for free chlorine residual in drinking water is 5 mg/L. The minimum recommended WHO value for free chlorine residual in treated drinking water is 0.2 mg/L. CDC recommends not exceeding 2.0 mg/L due to taste concerns, and chlorine residual decays over time in stored water.

• Free chlorine, combined chlorine, and total chlorine can be easily understood with the following equation: FAC + CAC = TC For example, if your free chlorine (FAC) levels and total chlorine (TC) levels are the same, then there's no combined (or used chlorine) in your water and there's no need to add any chemicals today.

• Free Chlorine. Free chlorine is defined as the concentration of residual chlorine in water present as dissolved gas (Cl2), hypochlorous acid (HOCl), and/or hypochlorite ion (OCl-).

The quickest way to get chlorine out of tap water is to boil the water uncovered for 5 minutes, this allows the chlorine gas to dissipate into the air. Another method is to draw the water and leave it sit uncovered for 24 hours. The chlorine will then dissipate naturally.

The maximum allowable WHO value for free chlorine residual in drinking water is 5 mg/L. The minimum recommended WHO value for free chlorine residual in treated drinking water is 0.2 mg/L. CDC recommends not exceeding 2.0 mg/L due to taste concerns, and chlorine residual decays over time in stored water.

Free chlorine, combined chlorine, and total chlorine can be easily understood with the following equation: FAC + CAC = TC For example, if your free chlorine (FAC) levels and total chlorine (TC) levels are the same, then there's no combined (or used chlorine) in your water and there's no need to add any chemicals today.

Free Chlorine. Free chlorine is defined as the concentration of residual chlorine in water present as dissolved gas (Cl2), hypochlorous acid (HOCl), and/or hypochlorite ion (OCl-).