Thanks for the explaination.SpeshulEd;4175607; said:I did this in paint, hopefully it'll help visualize it.
The water comes into the sump through the white plumbing with the red arrows on it. The water falls in to the plastic tube (with a bottom) with the blue. The tube fills up with water and raises to the black platform and into the filter socks. The water falls through the filter sock and into the first chamber where the yellow is. The water rises and spills into blue polyfill/drip plate. It drips through the bio balls and falls into the bottom of the second chamber where the orange is. There are holes down there allowing it to flow through the blue foam and up and over the last wall into the last chamber.