I don’t know specifically what you have but calcium reactors are all very similar. CO2 goes into them at the “bubble counter”. Tank water goes in at some other location and the calcium/alk water exits from another tube back into the tank.
Additional features may include a pH probe that sits in the lid of the reactor and that will plug into a pH meter/controller that turns on a solenoid on the CO2 regulator. People who run without pH control will have continuous CO2 dripping into the reactor and control the effluent speed to keep the reactor output stable.
Some people get a CO2 “Carbon Doser” regulator to help fine tune the flow of CO2.
To fine tune the water flow people add a dosing pump to keep the reactor running stable.
All the fine tuning is done with the addition of various control equipment (dosing pump, Carbon Doser, but these all just plug into the basic setup like the reactor you have. Look up any calcium reactor and the inputs and output locations are similar if not the same.