The other Pentair pump is running a few of the water features as well as an in-floor cleaning system. The 3rd pump will be running the bowels. We will be using Tri-Cor tablets for chlorination. With the aeration that we are doing it should help with the CYA. I understand as you have pointed out, that with the water flow into the catch basin that it will have an impact on the PH. I am having an outside service take care of the pool but I also have a test kit of my own to keep another set of eyes on the readings. Thanks for your continued comments and advice.