A rotary processor aerates the bleach and thus regenerates it as far as oxidation is concerned.

However, a bleach is used up by consuming halide ions and therefore oxidative regeneration is not, in itself, sufficient to restore the bleach to its original activity. Then there is the pH change to consider and other minor changes.

You cannot do this for too long of a time before you run into problems with retained silver, higher grain and reduced color saturation.

PE