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In a recent study, several field test kits for the determination of free available chlorine (FAC) were evaluated. In addition, modifications to the most promising test procedures were also evaluated. As a result, an improved method for the determination of FAC has been developed. This new procedure resulted from modification of the syringaldazine (liquid) procedure and is known as the free available chlorine test with syringaldazine (Facts).
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Cooper et al. (1975) studied this question.
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