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Twin-Tech Calcium Reactors

Introducing the the latest generation Deltec Twin-Tech Calcium Reactor, introduced by Reefbuilders as the “Supercar of Calcium Reactors”

Calcium reactors still remain the easiest and most stable method for making additions to the reef aquarium, requiring little testing to keep the system in balance.


  • Twin-Tech 1500 – for aquariums up to 1500 litres - 310 x 180 x 590mm
  • Twin-Tech 3000 – for aquariums up to 3000 litres - 390 x 240 x 590mm
  • Twin-Tech 10000 – for aquariums up to 10,000 litres - 440 x 300 x 920mm



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 litres, is being added to the aquarium within each 24-hour period, which is shown on a large LCD display in the centre 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.

Schematic Layout

Reactor Components

  1. Media chamber                             
  2. Gas chamber                                              
  3. Control unit                                                    
  4. Feed pump                                                      
  5. Non-return valve                                            
  6. Solenoid valve                                                  
  7. Float switch                                                     
  8. CO2 bottle and Regulator                                  
  9. Recirculation pump                                        
  10. PH probe position                                           
  11. Outlet from reactor                                        
  12. Top-up fill cap for media
  13. Bleed valve
  14. Float cap
  15. CO2 feed to gassing chamber
  16. Base plate
  17. Power supply to controller
  18. Optional timer system

Control Functions

  1. A – Mode button
  2. B – Water flow rate per 24 hours in litres*
  3. C – Degassing after ‘X’ litres*
  4. D – Recirculation pump speed %*
  5. E – Process active/complete %
  6. F – Increase button for items marked *
  7. G – Decrease button for items marked*
  8. H – Activity indicator green/yellow/red
  9.  J – CO2 valve open/active
  10. K – CO2 Bottle empty (audible alarm)
  11. L – Degassing cycle running

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