So, I think I may have solved our low Ph problem from the CA reactor. Every since I installed the reactor I havent been able to get the effluent Ph above 6.1 or so, which was very puzzling. I had the effluent dumping to a plastic jug which was about 6" deep, then over flowed into the sump. In this platic jug, I had the Ph2 probe measuring effluent Ph. Today my wife had a discussion about the jug being deep enough that the probe wasnt accurately measuring the Ph, which I disagreed with this threory. Anyway, I swapped out the jug with a much smaller glass container. The Ph immediately started climbing to where it should be and subsequently the Apex turned on the CO2 solenoid and seems to working properly. So, my question is: was it the deeper container affecting the effluent Ph or was it the plastic in the container?