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@Trivan
The powerbar socket controlling your solenoid should be set to pH value 2. That will allow the solenoid to be controlled based on the live pH values inside your calcium reactor. When the KHD is set to Calcium Reactor mode, it will step-in and adjust your pH probe desired value based on the outcome of each KH test.
If you set the socket function to KH Value Control, it will make the KHD the primary means of control for your solenoid, bypassing the pH probe values.
I recommend allowing the pH probe to be your primary means of control and the KHD to be the secondary control for minor adjustments.
The powerbar socket controlling your solenoid should be set to pH value 2. That will allow the solenoid to be controlled based on the live pH values inside your calcium reactor. When the KHD is set to Calcium Reactor mode, it will step-in and adjust your pH probe desired value based on the outcome of each KH test.
If you set the socket function to KH Value Control, it will make the KHD the primary means of control for your solenoid, bypassing the pH probe values.
I recommend allowing the pH probe to be your primary means of control and the KHD to be the secondary control for minor adjustments.