The Reef Octopus 250PRO Commercial Calcium Reactor is built for public aquariums, fish farms, and aquaculture centers up to 1,500 gallons. It runs the Water Blaster 7000 recirculation pump (70 watts) with silicone-carbide shafts and bearings so moving parts won't seize under continuous commercial duty. Capacity: up to 1,500 gallons Media capacity: 25 liters (6.6 gallons) Pump: Water Blaster 7000 recirculation pump, 70 watts, 2-year warranty Dimensions: 18.1in x 17.3in footprint, 10in body diameter, 43.3in 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 let you control media circulation separately from feed rate — useful for dialing in CO2/media contact time without changing how much water passes through overall.Compatible replacement parts: Water Blaster 7000 pump kits for the 250PRO.