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Reef Octopus VarioS CR220 9" Calcium Reactor

Sku: OCT-CALR220

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Reef Octopus VarioS CR220 9" Calcium Reactor

Sku: OCT-CALR220


Availability: Usually Ships in 4 - 5 Business Days After Submission of Order

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Rated for Aquariums Up To 500 Gallons

  • Efficient Variable Speed DC Pump
  • Apex Ready
  • Reverse flow and CO2 Recirculating Design
  • Auto Fill Bubble Counter
  • Probe Holder w/Plug*
  • Easy to Remove Lid
  • Precision Effluent Control Valve
  • Solid Construction
  • 1/4"quick connect fittings

* Does not include PH probe.

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The VarioS CR is perfectly capable of meeting the challenging task of maintaining alkalinity, calcium and trace elements on a demanding reef system. Quality, design and controllability define the Reef Octopus VarioS Calcium Reactor series. Available in 3 different models that feature the new VarioS variable speed pump and reverse flow water current reactor design to maximum water and Co2contact time with the media. All models come with PH probe holder(probe and PH controller sold separately) to monitor Ph levels in the main reactor chamber and built in bubble counters to monitor Co2 drip rates. 

How it works

A calcium reactor is essentially a chamber full of aragonite, which is the crushed skeleton of ancient hard corals. Aquarium water is pumped through this chamber along with pressurized carbon dioxide (CO2). The CO2 lowers the pH in the chamber to an acidic level which dissolves aragonite media into the aquarium water. In addition to dissolving the calcium, this process also dissolves nearly all the minerals and trace elements the coral used in order to grow.

Automated Calcium and Alkalinity supplementation - When set up properly and used correctly, a calcium reactor can maintain or increase calcium levels with little to no maintenance.


  • Body Size: 9in  
  • Footprint: 16.5in x 11in
  • Total Height: 23in
  • Media Capacity: 9.3L (2.5gal)
  • Inlet Size:  1/4in
  • Max Feed Rate: 150GPH 

Note: Suggest a feed pressure slightly higher than a full flowing influent

Recirculation Pump Information

Reef Octopus VarioS 6 variable speed pump
Max Wattage: 70w
Apex Ready Control via 0-10V

Manufacturer Warranty - 2 year warranty on pump and 1 year on reactor body 

Additional Information

Additional Information

Manual No
Product Specs


Manufacturer Reef Octopus


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