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Typically, the region around the sulfur media needs to be anoxic (lack of free oxygen) for denitrification to take place. If you are able to stick an ORP meter in there, you'll then be able to know if that condition is reached (and denitrification taking place). In a sulfur denitrifying reactor with about half to 1 liter of sulfur, the effluent rate is typically around 1 drip per second. Hence, i'm not sure if 'increasing flow' be counter productive instead.