This model is generically named the SUMP model because it can be used as a berlin style sump or as a refugium style sump.
SUMP model has 3 main sections. Water enters from the tank into Section 1 through the filter socks. Section 1 is typically where the protein skimmer sits. Then the water flows through a slit in the first baffle into Section 2. Section 2 is typically used as a refugium. If a refugium is not desired then the protein skimmer or other equipment can be housed here. The water then flows over the second baffle through 2 perforated platforms and under the third baffle into Section 3. The top perforated baffle comes with a foam block filter and the bottom one is open to use for several different filtration methods (bag of carbon, bio balls, rubble rock, etc.). Section 3 is the return water section back into the tank. This is where the return pump will sit.
The ELITE models allow for separate water flow through the refugium section allowing for faster flow through the rest of the sump.
Section 1 of the ELITE diagram above is the refugium section. The flow rate through the refugium can be controlled based on the type of algae that is housed there. There are several ways to feed water into the refugium.
If splitting off one of the drains from the tank is the method chosen, then it is recommended to put valves on both lines after the split to control flow. Water flows from the refugium into Secton 2. Section 2 is where the water from the main tank enters through the filter socks. This is the section where the protein skimmer typically sits. Water from this section goes over a baffle and through a foam block filter which is provided and then under a baffle into Section 3. Section 3 is the return water section back into the tank. This is where the return pump will sit.