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Chlorination is the final step in the treatment process. Chlorine disinfects the effluent, killing whatever pathogens may remain. AguaClara plants use a flow control module (FCM) to regulate chlorine dose. The chlorine flow is driven by available head in the FCM and the dose is changed by increasing or decreasing this available head. Chlorine is added in the plant. The residual from this chlorine should guarantee protection from pathogens along the distribution line. In this study, the chlorine residual was measured daily in the storage tank, and three houses along the distribution line. Additionally, samples were taken from the storage tank and the chlorine residual was measured in them over time. The flow rate in the chlorinator was measured to make sure the FCM was delivering the expected dose.
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