Well, to be clear CO2 has everything to do with pH. There was just something that interfered with allowing the CO2 scrubber you used from removing enough CO2 from your tank for you to notice a difference. Do you have a lot of surface agitation? CO2 in your house could be extremely high. You can do an aerating cup pH test with it in your house for at least 15 minutes. And then take outside for at least 15 minutes. I'm not very familiar with Ca reactors as I've never needed to use one but couldn't they also potentially drive down pH? How fast did the Sodalime change colors to purple? You should easily start seeing a change at the bottom in a couple hours. My BRS reactor full of sodalime lasts a few days to a week depending on how much air flow I dial it in to.