A sump stores both equipment and the excess water needed to run that equipment. It constitutes the primary filtration center and emergency-safeguard system of an aquarium.

One side of the two chambered sump, the "clean" side, holds extra water for the aquarium's operation. In the event of power loss, the aquarium will drain to the top of it's overflow box, and the excess will be safely stored in this chamber. The other chamber, or "dry" side, is separated by a short wall. Water spills into the dry side and collects before being pumped back to the aquarium.

Our Berlin Sumps come complete with an adjustable prefilter and optional skimmer.