The Reef Octopus 300PRO Commercial Calcium Reactor is rated for commercial systems up to 2,700 gallons — public aquariums, fish farms, and aquaculture centers. It runs the Water Blaster 10000 recirculation pump (125 watts) with silicone-carbide shafts and bearings built for continuous commercial duty. Capacity: up to 2,700 gallons Media capacity: 45 liters (12 gallons) Pump: Water Blaster 10000 recirculation pump, 125 watts, 2-year warranty Dimensions: 22.1in x 21.3in footprint, 12in body diameter, 49.3in height Feed requirements: requires a separate feed pump rated 600-1,000 GPH (Water Blaster 3000 suggested) Monitoring: pH probe holder in the first chamber, built-in bubble counter Independent flow valves separate media circulation control from feed rate, letting you fine-tune CO2/media contact time on a system this size without re-plumbing.Compatible replacement parts: Water Blaster 10000 pump kits for the 300PRO.