I'm designing my own refugium and sump. One unit is completely separate of the other. I'm using Melv's stacked design. The problem is, he doesn't use socks and I can't clearly see how his incoming water chamber is set up. I've looked at literally hundreds of designs and they are all different. In the refugium unit, I'm using 2 - 4" filter socks on the incoming water line. Should that chamber hold water or should the water only be at the very bottom of the chamber...say a couple of inches? This will determine where I place the dividing wall. My concern for water at the bottom is noise.
Opinions?
Opinions?