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What is Free Available Residual Chlorine?

April 26, 2017chlorine Free residual

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What is Free Available Residual Chlorine?

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Free Available Residual Chlorine (FRC) is Free Available Chlorine after treating the water with chlorine. That portion of the total available residual chlorine composed of Dissolved Chlorine gas cl2), Hypochlorous Acid (HOCl), and/or Hypochlorite Ion (OCl-) remaining in water after chlorination. This does not include chlorine that has combined with ammonia, nitrogen, or other compounds.