Dr Joe, thqanks so much for viewing my clip, I need your advice.
To answer your questions:
Q - "What are you using for a pre-filter?"
A - in the barrel I have 6 large floor buffing pads on top of all of the scrubbies.
In the tower I have a cut stack of floor buffing pads , 6 inches thick that fit inside the large pipe on top of all the pot scrubbers.
(It's not a tight fit but it's close)
There is also a 1/2 inch overflow pipe inside the big pipe in case the filter pads clog completely.
No but I can tell you and I can shoot some video tonight where I go over how the water will flow.
The QUESTION I have is will a pump be able to lift the water this high?
As I built this filter design it seemed fine, but today as I finished I stood back and looked at the tower and thought to myself, "Holy Smoke, thats up there!"