So I attached a pic of my rear sump. I used the JBJ specs sheet JBJ sent me. Dont look at the measurements as they are all off! The JBJ specsheet must have been for a prototype as it didnt even include two compartments one on each side of the pump. From left to right my filtration is as follows.
1. 4” filter sock
2. Refugium with home made DIY basket.
3. Heater column fairly large compartment about three inches wide.
4. Pump compartment in center
5. Currently empty just a sponge on top to capture micro bubbles from the skimmer. Thinking of adding a calcium reactor.
6. Skimmer Compartment
7. 4” filter sock