The Reef Octopus OCTO CR200 (CalReact) Calcium Reactor w/ VarioS 4 multiple speed pump meet the challenging task of maintaining alkalinity, calcium and trace elements on a demanding reef system. All models come with a PH probe holder (probe and PH controller sold separately) to monitor Ph levels in the main reactor chamber, and also come with built in bubble counters to monitor Co2 drip rates.
