Response to 1 roll in a 2 roll tank

You can get very different agitation. Image a single roll tank (capacity of liquid=250mL) with a single roll, and developer almost up to the lid. Inverting this will, in effect, cause a bubble of about (I'm guessing here) 40mL to go through the film reel area and back again.

Now imaging the same film and quantity of liquid in a double sized tank. Tipping it upside down drains all of the liquid from the film.

This must result in much greater redistribution and maybe by draining the film, it hay have a greater effect of removing and replenishing the liquid in the emulsion of the film.

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