My new design is working really good. Hopefully urbanfarmer will be posting some pictures of my redesigned swirl filter. the intake line goes down through the center to about 4 inches above the bottom. the water then cycles upward through gravel and some 3M type scrubber pads and then drains out a 1 inch pipe to my float troughs. It works great and I am sure you guys can come up with better designs and filter components but this design work really good.