The new Turbo Chalk Reactor Control III with the built in solenoid and check valve is mounted outside of the Turbo Chalk Reactor of AquaCare. With the long cables of sensor (2 m) and mains plug (1,5 m) you have a long radius of working. Because the important components solenoid and check valve are built in it is nearly impossible to mix up the flow direction of the CO2. The work for the aquarist is less. An overdosing of CO2 is not possible independent of the chosen CO2 flow (bubbles per seconds). The accuracy is better compared to the control I. For this lime reactor control you do not need a pH probe, that should be calibrated regularly. With this control an automatic controlling of CO2 for the Turbo Chalk Reactor is possible. If the internal pH value is controls right, the water has the maximum power for dissolving the Turbo granules. This control is suitable for all Turbo Chalk Reactors. With the start and if too less CO2 is in the reactor the solenoid opens and is dosing CO2 into the reactor. If the right volume of the gas is in the reactor the control shuts off the CO2 flow.