A refugium filter setup for an aquarium.
35 gallon sump setup freshwater - Google Search
75 Gal w/ DIY Custom Stand and DIY Sump/Refugium - low tech aquarium More
Detailed information on a freshwater sump (plus bonus DIY stand)
Saltwater Sump Diagram | http://cdn.saltwaterfish.com/3/31/31...SUMPLAYOUT.png
Looking to build a RO/DI and Saltwater Mixing Station for your Saltwater Aquarium? Check out ours!
Building a 10 gallon aquarium sump on a budget!