First what you should do is start the reactor up and let it run for a few hours. Get your effluent rate set and try to run your effluent rate a little faster then normal like maybe 40 mil a min. once you have your effluent rate set and thing seem to be owrking good start to add you co2 bubbles. I would start your bubble rate at about 10-15 bubble a min. Then watch you alk and add more bubble per min depending on if your alk drops. One thing I have learned is if your effluent rate is to slow the outlet valve will get clogged over time. How are you feeding your reactor?