Geo's are really nice. But really, much more important than what brand acrylic tube reaction chamber you buy, it which Co2 regulator and manner of effluent control you buy.
I use a carbon doser and for the price, it is phenomenal. I know there are much better 2 stage regulators but the carbon doser is 100% sufficient for running a calcium reactor.
I currently use a nice needle valve on the output and tap the feed off the return pump. This has been a very effective setup for me for several tanks. That said, I'll probably break down at some point and buy a versa which, if they end up being reliable over the long haul, will probably be the bee's knees for calcium reactor feed.
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