Sean,

I updated the end of my post
See Above
to reflect what is consistent with your point of slower moving water in the cell getting longer contact time in a superchlorinated environment. We haven't heard from you so I hope I didn't offend. The theories about extra chlorine being generated and then breaking down just don't add up, but the theory of slower moving water at higher chlorine concentration does make sense. It's just that this doesn't actually superchlorinate all of the pool water quickly -- it would take weeks. You can either slow down the flow in a good part of the cell and have this part be exceptionally superchlorinated or you can have the water flow evenly through the entire cell at small chlorine boost, or a combination of the two, but you can't get the full benefits of both (superchlorination and full pool volume) at the same time.

Richard