Commercial Reactor for Calcium The Reef Octopus 300PRO Commercial Calcium Reactor was created especially to meet the demands of the commercial industry, which includes fish farms, public aquariums, and aquaculture facilities with a capacity of up to 2,700 US gallons. Among the features of the Super Reef Octopus calcium reactors are an effective recirculation pump, excellent craftsmanship, a 2-year pump warranty, and a high-performance reverse flow design. There is no need to worry about moving parts freezing up and breaking shafts because our commercial calcium reactors come with our very own high water volume Water Blaster pumps, which are standard with Silicone Carbide shafts and bearings. equipped with integrated bubble counters to track the rate at which CO2 drips out of the reactor and a pH probe holder to keep an eye on the PH inside the reactor's first chamber. to assist