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CRTT Series Calcium Reactors


Fully automated calcium reactor, New CO2 saturation and degassing technology, Achieves stable KH while regulating CO2 gas, Easily adjustable controller, Audible CO2 alarm when out.


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This latest generation reactor operates on the principle of total CO2 saturation by the continuous recirculating of the water in the reactor through a large bubble of gas.

The CO2 dissolves in the water until it is fully saturated, which occurs at a very low pH, at which point no further gas can be dissolved until additional water is added to the reactor. The whole process is controlled automatically by the digital controller and float switch in the gas chamber.

As the CO2 bubble dissolves in the water, the water level rises, which raises the float switch and triggers the solenoid valve to add more gas to replenish the bubble.

The innovative Twin-Tech reactor has several unique features providing simplicity of control but also relating to the way that the system feeds the reactor with water from the aquarium.

The smart controller on the Twin-Tech uses a built in flow meter to accurately measure the volume of water passing into the reactor, information it uses to control a standard DC feed pump. This feature allows the user to know exactly how much reactor effluent, in liters, is being added to the aquarium within each 24-hour period, which is shown on a large LCD display in the center of the controller.

The water flow can be adjusted by the user between 10 and 350lt per day simply by pressing two up and down buttons on the panel.

The reactor as standard consists of the following items.

  • Large media chamber.
  • Smaller gas chamber with float switch.
  • Controller with separate power supply unit.
  • Recirculation pump and connections.
  • Feed pump with suction filter.
  • Low voltage solenoid valve.
  • Hoses and non-return valves to connect the unit.

Not included

  • CO2 bottle, CO2 regulator (important, 2 stage regulator is required) and CO2 hose.
  • Calcium reactor media.

Aquarium size up to 400 gallons, Dimensions (LXBXH) 12.25 x 7 x 23.25 inches

Calcite media size: 12-16 mm- Volume 4 Liter  5.5 kg (12.1 lbs)

Aquarium size up to 800 gallons, Dimensions (LXBXH) 15.5 x 9.5 x 23.25 inches

Calcite media size: 12-16 mm- Volume 10 Liter  13.5 kg (29.7 lbs)

Aquarium size up to 2600 gallons, Dimensions (LXBXH) 17.5 x 12 x 36.25 inches (special order takes 3-4 weeks)

Calcite media size: 12-16 mm- Volume 30 Liter  40 kg (88 lbs)

Deltec’s Twin-Tech Calcium Reactors have been voted as one of Reefbuilders top 10 products of 2018. Read the review here.




Deltec CRTT Series Calcium Reactors Operating Manual

Deltec Twin Tech Spare Parts List Instructions

Additional information


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