Free chlorine residual definition

Free chlorine residual. OR “Free Available Chlorine” means the portion of the total available chlorine that is not “combined chlorine” and is present as HOCl or hypochlorite ion (OCl-).The pH of the water determines the relative amounts of HOCl and hypochlorite ion. HOCl is a very effective bactericide and is the active bactericide in pool water. OCl- is also a bactericide, but acts more slowly than HOCl. Thus, chlorine is a more effective bactericide at low pH than at high pH. A free chlorine residual must be maintained for adequate disinfection.‌‌
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Free chlorine residual means the amount of hypochlo- rous acid remaining in the water as determined by a diethyl−p− phenylene diamine test kit or approved equivalent.
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Free chlorine residual means the portion of the total available chlorine that is not “combined
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Examples of Free chlorine residual in a sentence

  • Disinfection – Free chlorine residual shall be 1 milligram per liter (mg/L) to 10 mg/L, inclusive, in conventional swimming pools and 2 mg/L to 10 mg/L, inclusive, in all other type pools such as spa-type pools and interactive water fountains; bromine residual shall be 1.5 mg/L to 10 mg/L, inclusive, in conventional swimming pools and 3 mg/L to 10 mg/L, inclusive, in all other type pools.

  • Free chlorine residual in drinking water is important in providing lasting protection in water distribution systems.

  • Free chlorine residual, combined chlorine, and pH must be measured and recorded concurrent with sample collection.

  • Chemical water quality standards for hot tubs and spas MinimumIdealMaximum Free chlorine residual (parts per million (ppm)) APPENDIX E.

  • Free chlorine residual will be measured and recorded from the outlet end of the contact chamber.


More Definitions of Free chlorine residual

Free chlorine residual means the amount of hypochlorous acid remaining in the water as determined by a diethyl−p−phenylene diamine test kit or approved equivalent.means the portion of the total available chlorine that is not “combined chlorine” or “Cyanurate-bound available chlorine” and is primarily present as hypochlorous acid (HOCl) or hypochlorite ion (OCl-).
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Free chlorine residual means the portion of the total available chlorine that is not “combined chlorine” and is primarily present as hypochlorous acid or HOCl-, hypochlorite ion or OCl-, or Cyanurate-bound available chlorine.
Sample 1
Free chlorine residual means the amount of hypochlo- rous acid remaining in the water as determined by a diethyl− p−phenylene diamine test kit or approved equivalent.
Sample 1
Free chlorine residual means the amount of hypochlorous acid remaining in the water as determined by a diethyl−p−phenylene diamine test kit or approved equivalent.
Sample 1
Free chlorine residual means the available disinfectant in the water. It is the portion of total chlorine that is not combined chlorine and is available as disinfectant. When chlorine is added to
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Free chlorine residual means the available disinfectant in the water. It is the portion of total chlorine that is not combined chlorine and is available as disinfectant. When chlorine is added to water, hypochlorous acid is produced in either the molecular state (HOCl) or the ionized state (hypochlorite ion (OCl-) plus hydrogen ion (H+)), and a by- product specific to the type of chlorine is produced. The pH of the water determines the amount of hypochlorous acid in each state. HOCl is a very effective bactericide and is the active available chlorine disinfectant in the water. OCl- is also a bactericide, but acts more slowly than HOCl. Thus chlorine is a much less effective bactericide at high pH. The sum of HOCl and OCl- is referred to as “free chlorine” in pool water. The hypochlorous acid that remains in pool water uncombined with ammonia is called “free chlorine residual.” A free chlorine residual must be maintained for adequate disinfection.
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Free chlorine residual means the chlorine concentration, in parts per million (ppm) of water, available for rapid and effective biocidal action. This is the chlorine, which remains uncombined with nitrogenous compounds after the initial chlorine demand of the water has been satisfied.
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