I have used it but not on the same day, just the 2 days before flush day. Some people used it the day after too, because they did not like ES.I have also done just some ES 2 evenings before I mainly did it so at the end of the flush there was just butt pee
so you can see what came out from the flush.
I remember one poster who used the Oxypowder instead of the ES, but I can't remember her name to look it up.