A way to have pH dependant ATO with Apex.
 

I want to run dual pumps in my ATO resivore. The first pump is typically activated when the water level triggers the ATO and runs ATO resivore-> kalk reactor-> sump. However if the ATO is tripped and the pH is over a set point, lets say 8.4. The first pump wont kick on but the second will running ATO resivore-> sump and there by bypassing the kalk reactor. Can I make this happen with the Apex programming?