CO2 Scrubber

What do you guys tyink about c02 scrubber? I just bought some in hopes of decreasing my co2 content and increasing pH. My pH has been so low. It's sitting between 7.5-7.8. I'd like it around 8.1. I've tried running my skimmer air tube outside which did slightly bring up my pH to 7.9 but that was about it. Alk is 9. Ca is 500. Temp is 78*F. Salinity is 1.025