Convenient sump for enhanced reef aquarium filtration Reef sump increases aquarium water volume for stable parameters Install protein skimmers and other aquarium filtration devices Versatile sumps designed for today's reef and saltwater aquarium hobbyists. Eshopps Reef Sumps feature ample, usable sump area to accommodate protein skimmers, pumps, and other supplementary aquarium devices. Open-top design allows easy access for convenient equipment maintenance. Includes square foam, 1" bulkhead, 3 ft. x 1-1/4" flex hose, and 200 micron bag. Requires pump , return line , and overflow box system for aquariums that are not drilled for plumbing. Additional Bag Holder and Filter Bags sold separately. Model Dimensions Sump Capacity (gallons) Skimmer Area (L x W) For Aquariums Replacement Filter Sock Size RS-75 18" x 10" x 16" H 10 12" x 10" 10-75 gallons 4" round RS-100 24" x 12" x 16" H 20 12" x 11" 75-125 gallons 7" round RS-200 30" x 12" x 16" H 25 18" x 11" 125-225 gallons 7" rectangular (x2) RS-300 36" x 14" x 16" H 35 25" x 13" 225-300 gallons 7" rectangular (x2) Please click on "More Information" for additional sump information.