I've been fascinated by this discussion and I'm continually trying to understand.

Are you saying that because the water "between the blades" is 80+ppm chlorine while the water exiting the cell is only 1-2ppm higher than the pool itself that the high CYA acts as a transport of that high chlorine? Sort of a way to get it into the pool?

That logic makes sense to me.....what Doesnt make sense is when Ben's best guess chart comes into play.

The chlorine in the pool, regardless of where it came from, has the same chemical properties as any other chlorine.

In my experience, when I ran my SWG at 80ppm CYA, my chlorine maintained at a lower power setting....as suspected. However, Algae on the walls and in the pool ran out of control and I fought it all season.
Ever since I lowered my CYA to 35-40ppm, I've not had to shock my pool once and haven't had a hint of "slimy walls" or the onset of algae.

There could be other factors at play since my tests were over the course of 2 seasons...