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You are here: Home / Explanatory Dictionary / Free Available Chlorine

Free Available Chlorine

the concentration of residual chlorine present as dissolved gas, htpochlorous acid or hypochlorite, not combined with ammonia or in other less available form.

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Water Quality Specialists

Definitioner

Residual
the amount of a specific material remaining in the water following a water treatment process. May refer to material remaining as a result of incomplete removal or to material meant to remain in the treated water.
Hypochlorite
the "OCI" anion,; calcium and sodium are commonly used as disinfecting agents
Chlorine
a gas, widely used in the disinfection of water and an oxidizing agent for organic matter, iron, etc.
Acid
A substance which releases hydrogen ions when dissolved in water.Most acids will dissolves the common metals, and will react with a base to form a neutral salt and water.