Water and Wastewater Terms Beginning F
A B C D E F G H I J K L M N O P Q R S T U V W Y Z
free available chlorine residual
The amount of chlorine available at the end of a specified contact period in chlorinated water or wastewater. This residual may be in the form of dissolved gas (Cl2), hypochlorous acid (HOCl), or hypochlorite ion (OCl–), but does not include chlorine combined with an amine (ammonia or nitrogen) or other organic compound.
