I've been running a Ca Reactor since 2006. My current PM 622 (old down flow style) was purchased used and has worked very well for me since 2007. The only issue I've had is with the CO2 Regulator. I tried a Milwaukee and then an Aquariumplants.com unit, both have given me more trouble than they should have. I'm not sure what the best on the market is right now but its well worth your while to not cheep out there.
Total system volume is 240gal.
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