<p>At my old darkroom, we did a pre-wet before developer - I always did a good 3 minutes, constant agitation. After that - before stop bath, it was "fill tank-pour out water" 4times. Then again before fixer. I'm surprised to learn that "this" was all wrong, in fact maybe harmful. We all give a good 5-10 minute rinse after hypo clear, but what's the reason/truth behind all this other watering?</p>