The Eshopps’ Advance Series sump is two filters in one, part open Reef Sump, part Refugium, and is designed for aquariums. Incoming water enters a degassing chamber, and then is diverted into the separate sump and refugium chambers. The open sump chamber is large enough to house a Protein Skimmer, Media Reactor, or other equipment. The sump also has a built in probe holder. The refugium is large enough to grow nutrient consuming macroalgae, and includes an acrylic light stand. The Advance series filter also features a baffle between the sump/refugium compartments, and the return pump chamber, that contains a foam block to remove air bubbles, and further trap debris. The filter comes with flexible drain hose, to connect to your drilled aquarium, or Hang-On overflow box (not included).