Off spec performance calculated by volume or time can provide significant under or over estimations of the public health benefits of UV disinfection system performance. As an alternate to off spec calculations, a UV System log credit, calculated as an integration of UV system performance
across reactors and as a function of time, is proposed. Benefits of the approach are simplified yet more meaningful reporting of UV system performance, quantification of the health impacts of off-spec performance, and justification for operating strategies that use over dosing to offset minor
off spec performance events.
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