I'm not sure if that's a joke or not. I realize that the water which
has fully reached the top will not backflow since it is lower than the
end of the screw. However, any water inside the screw will flow back
down into the lower pool if the screw speed is insufficient to keep up
with the pull of gravity on the water. Am I missing something?

On Thu, Jul 8, 2010 at 9:03 PM, John Gardner <goflo3@gmail.com> wrote:
> What backflow? =A0 :)
>
> Jack
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