Consider the risk of killing off your custom grown fixed film bugs.  If you surge or have a toxic event, then getting them back and acclimated could take several weeks to get it back.  Better have some storage.  If you use an AOP, then you are talking about hours to a couple of days to that a system may be down, and you immediately return to making quality effluent if it is followed by regular AS.  Just think of the risk if you have a “variable” process and get hit with a critical to quality event.  Happy that the other process is working well, but just consider the risk versus reward and ask yourself how lucky do you feel?  Best of luck, my friend.  Sean L Roop

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Consider the risk of killing off your custom grown fixed film bugs.  If you surge or have a toxic event, then getting them back and acclimated could take several weeks to get it back.  Better have some storage.  If you use an AOP, then you are talking about hours to a couple of days to that a system may be down, and you immediately return to making quality effluent if it is followed by regular AS.  Just think of the risk if you have a “variable” process and get hit with a critical to quality event.  Happy that the other process is working well, but just consider the risk versus reward and ask yourself how lucky do you feel?  Best of luck, my friend.  Sean L Roop