The Reef Octopus SRO 6000EXT External Protein Skimmer is a high-performance, recirculating filtration device specifically engineered for large saltwater reef aquariums up to 700 gallons. Designed to operate externally, it efficiently removes dissolved organic compounds and particulate waste from the water column, significantly improving water clarity and overall water quality for a healthier marine environment. This crucial piece of equipment ensures optimal conditions by preventing the buildup of harmful nitrates and phosphates. Key features of this model include a Bubble Diffusing Chamber and Hybrid Cone Body, which work together to stabilize foam production and maximize contact time for organic removal within the skimmer neck. It boasts an oversized air silencer for exceptionally quiet operation and a large collection cup with a drain for easy maintenance. Precision control is achieved through an easy-to-turn output flow valve, while power is supplied by the highly efficient Reef Octopus Bubble Blaster HY-5000s pinwheel pump, drawing 2,100 lph of air with only 45 watts of power. The unit has a 12-inch body, a 20.5-inch by 17-inch footprint, and stands 29 inches tall, requiring a separate feed pump with a recommended rate of 1100-1300 GPH. The SRO 6000EXT is an ideal choice for serious reef aquarists managing substantial marine systems up to 700 gallons who demand superior water purification and quiet, reliable performance. Its external design allows for flexible placement outside the sump, making it suitable for setups where internal space is limited or where a dedicated skimmer room is available. With its robust construction and advanced design, this skimmer provides a long-term, effective solution for maintaining pristine water parameters in demanding reef environments.