I think the suggestions ...

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I think the suggestions already given should be checked, especially the on by Ken Martins.  Another thing to look into is the capacity of the equalization basin and the schedule of the processes taking place in the manufacturing operation.  Do they do something different the same time every day that could possibly effect the chemical properties of the effluent - flushing, cleaning, certain process, etc? Depending on the size of the equalization, and the sequencing of the SBR's, the effluent from a certain process more to one SBR than the other.