Reef Octopus

CR140 5.5" Calcium Reactor

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Discontinued by Bulk Reef Supply
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Maintain the calcium and alkalinity in your reef tank with CR140 Calcium Reactor from Reef Octopus.

  • Rated for aquariums up to 200 gallons
  • Reverse flow and CO2 recirculating design
  • Aquatrance 2000 Pump
  • Bubble counter
  • pH probe holder included (probe sold separately)


A calcium reactor is used to maintain a balanced amount of calcium and alkalinity in your reef tank. In order to use a calcium reactor, you will need a CO2 regulator, CO2 tank, pH probe/controller, small feed pump (flow rate should be set 1-2 liters per hour) and calcium reactor media.


Filtration Handling

Well Stocked Tank - Rated up to 100 gallons

Medium Stocked Tank - Rated up to 150 gallons

Light Stocked Tank - Rated up to 200 gallons



  • Reverse flow design
  • Control the reactor with CO2 needle valve and the effluent valve
  • Auto fill bubble counter
  • pH probe holder
  • Easy to remove lid
  • Precision effluent control valve
  • Solid construction
  • 1/4" quick connect fittings


Reactor Specifications:

  • Body Size: 5.5”
  • Foot Print: 12” x 11”
  • Total Height: 24”
  • Media Capacity: 3.8L
  • Inlet Size: 1/4"
  • Max Feed Rate: 150 GPH
  • Suggested feed rate is slightly higher than a full flowing influent


Aquatrance 2000 Pump Features:

  • Quiet operation
  • Power Consumption: 45 Watts


Manufacturer's Warranty

  • 2 year on pump
  • 1 year on reactor body


Reef Octopus Calcium Reactor Manual

More Information
UPC 6950291210494
Media Capacity 4 Cups / 946mL, 5 Cups / 1183mL, 6 Cups / 1419mL
Reactor Placement External, In Sump
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