Due to PH rise i need to adjust my spa spill over. i did search this topic but i just wanted to confirm i was understanding correctly. I currently run my pool in "pool mode" and as you can see in this position the return valve allows flow to both the spa and the pool. This creates the constant spill over. I would like to change the set up where in one mode it does not return any water to the spa and then in another mode it is set up like my current setting, return water to both pool and spa. I read about using Aux3 to make this happen. When i turned Aux3 on nothing moved. So i think i need to turn on the dips Switch #3. But in my picture below i have 2 number 3's. Which one do i use? Also do i need to adjust the valve and actuator to make this work as described above?