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Reef Octopus CR140-D Reverse Flow Calcium Reactor 5.5" Dual Chamber with pump, by CoralVue*

Product code: 640
CR-CV-OCT-CR140D

Availability: In stock

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$409.99
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Reef Octopus CR140-D Reverse Flow Calcium Reactor 5.5" Dual Chamber with pump, by CoralVue*  

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.

Reef Octopus CR140-D Reverse Flow Calcium Reactor 5.5" Dual Chamber with pump, by CoralVue*  

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

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


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  1. Just what i needed Review by kevin
    Product Rating:

    This CA reactor works great once you get it dialed in, i have Mag in it along with coarse media in one camber and smaller in the other, i burn through this stuff my, MAG an CA levels stay the same all the time now. i hated dosing (Posted on 2/8/2015)

  2. Sweet once set up Review by Bluefool

    The instructions that come with this are *terrible*. Worse than Japanese stereo instructions from the 70s. Its a tough job to figure out what goes where. With decent instructions I would have given this 5 stars.

    It also needs coarse media; normal CA reactor media will clog it and fry the pump.

    Once it is set up tho....very sweet. Makes a bit of noise, but mine may still need to break in a bit. Its also built like a truck and has a solid base. (Posted on 10/22/2010)


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