Don't sweat the pH in the reactor - just test the effluent dKh and forget about the pH. Just make sure that the tank dKh stays stable. I don't recommend to worry about tank pH either, but if you are 8.1 to 8.3, then you are plenty fine.
I just tested the other day and my reactor dKh was about 21. This is keeping me at 6.8 right now. Over the next few months, this will drift to 6.6 or 6.5 and I will turn up the reactor and remeasure... it could be 20 or 28 or whatever and I don't care as long as the tank dKh is good - it is impossible to exactly hit the ratio in the head, so the output will vary slightly which is cool. The tank dKh will slowly climb to about 7.2 over a week or two and then start to fall again. This is a normal cycle if you are growing things.
Letting the CaRx run 24/7 will also keep your tank pH as high as possible. The co2 is more efficiently used and the on/off dump with a solenoid will not happen which lets a lot of unused co2 out of the chamber and into the tank. My tank pH barely moves with my CaRx running, but we constantly have windows open and fresh air in the home - I mean like thousands of cubic feet per day and not a single window cracked an inch. The co2 in your home will determine tank pH more than your reactor will. The reactor can exacerbate a low pH tank in a closed up home, but the co2 in the ambient air is the issue, not the CaRx.
I just tested the other day and my reactor dKh was about 21. This is keeping me at 6.8 right now. Over the next few months, this will drift to 6.6 or 6.5 and I will turn up the reactor and remeasure... it could be 20 or 28 or whatever and I don't care as long as the tank dKh is good - it is impossible to exactly hit the ratio in the head, so the output will vary slightly which is cool. The tank dKh will slowly climb to about 7.2 over a week or two and then start to fall again. This is a normal cycle if you are growing things.
Letting the CaRx run 24/7 will also keep your tank pH as high as possible. The co2 is more efficiently used and the on/off dump with a solenoid will not happen which lets a lot of unused co2 out of the chamber and into the tank. My tank pH barely moves with my CaRx running, but we constantly have windows open and fresh air in the home - I mean like thousands of cubic feet per day and not a single window cracked an inch. The co2 in your home will determine tank pH more than your reactor will. The reactor can exacerbate a low pH tank in a closed up home, but the co2 in the ambient air is the issue, not the CaRx.