I have a GEO 612 calcium reactor in great condition with a new 20lb and 5 lb. CO2 bottles. Dual regulators, pH controller with Milwaukee pH meter, calibration solutions, Eheim 1048 pump and a full ARM calcium reactor media and another about 90% full.
Everything you need and a lot easier than dosing. Once it's set, it's very little maintenance and good if you are leaving out of town. I rarely tested my water with this. Got rid of my SPS a while ago so I don't need this any more. This is a very good reactor and I never had any issues with it. $425 for everything.
Here's all the specs:
http://geosreef.com/index.php/products/calcium-reactors
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