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CO2 is in the atmosphere too. So, if you have elevated levels of CO2 in your household atmosphere, through gas exchange, your pH in your system, will go down. If you can open windows, the CO2 levels will go down, and your pH will go up. By removing the CO2 via a scrubber, you are introducing...
I don't have any experience with these, so take this for what it's worth, but Waveline has a DC 12000 (3,170 gph max at 19 ft.)that would be more powerful, and I think they are all made in the same place, just a horse of a different color.
I replaced two Mag 9's with a Diablo 10500, and cut my energy consumption better than in half, i.e. 85w vs 186w. Having said that, I'm sure my heater is working a little harder too.
For another $40m you can get about 4 times more, i.e. 37 lbs. vs 9 lbs.
http://www.wayfair.com/Molecular-Products-Gallon-Pail-Sodalime-120020-00-AMW1000.html?refid=ER&mmid=59905639&csnid=F7860E61-3B15-4405-975B-ECDDAA05BA76#specs