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The FAS DPD test is a method for monitoring chlorine and bromine levels without color matching. The test involves adding drops of ferrous ammonium sulfate to a sample with DPD indicator until it changes from pink to colorless. The number of drops needed determines the oxidizer concentration. This method is cost-effective, eliminates waiting time for color development, and is easy to recognize the endpoint without distinguishing color gradations. Chlorine is crucial for effective treatment programs in various applications.