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Reef Octopus CR140D Dual Calcium Reactor

Sku: OCT-CR140D

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Reef Octopus CR140D Dual Calcium Reactor

Sku: OCT-CR140D


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

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  • Reverse flow and CO2 Recirculating Design
  • Dual Camber 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.



Quality, design and affordability define the Octopus Calcium Reactor series. Available in 3 different models that feature reverse flow water current for maximum water and Co2contact time with the coral media. All models come with PH probe holders to monitor Ph levels in the main reactor chamber and built in bubble counters to monitor Co2 drip rates. To help you meet the challenging task of maintaining alkalinity, calcium and trace elements , consider adding a Reef Octopus calcium reactor to your aquarium system. 

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.


  • 225 Gallon – Light Demand 
  • 182 Gallon – Medium Demand 
  • 150 Gallon – Heavy Demand 

Techinical Specs

Body Size: dual 6″  chambers
Footprint: 15.8″ x 9.5″
Total Height: 22.8″
Media Capacity: 2gal (7.6L)
Inlet Size:  1/4"
Max Feed Rate: 150GPH 
Note: Suggest a feed pressure slightly higher than a full flowing influent

Recirculation Pump Information

Reef Octopus Aquatrance 2000
Wattage: 45w

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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