Reef Octopus

Reef Octopus CR140 Calcium Reactor

UPC/EAN: 6950291210494
$ 607.49
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A single chamber 5.5 inch calcium reactor suitable for aquariums up to 150 gallons

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.

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

Quality, design and affordability define the Octopus Calcium Reactor series. Available in 2 different models that feature reverse flow water current for maximum water and Co2 contact time with the coral media.

Both 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.


  • 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
  • 1 year Pump warranty

CR-140 Specifications

  • Tank Capacity: 100 - 200 Gallons
  • Body Size: 5.5 inches
  • Footprint: 12in x 11in
  • Total Height: 24in
  • Media Capacity: 3.8L (1gal)
  • 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 Aquatrance 2000 water pump
    • Max Wattage: 45w

*pH probe sold separately.