Definitions for "Free Available Chlorine"
The concentration of residual chlorine present as dissolved gas, hypochlorous acid or hypochlorite, not combined with ammonia or in other less readily available form.
That portion of the total chlorine remaining in chlorinated water that is not combined with ammonia or nitrogen and will react chemically with undesirable or pathogenic organisms.
that portion of the total chlorine that is not combined chlorine and is available as a sanitizer. (N)