A calcium reactor can only maintain your levels. You may have to adjust them periodically by adding liquid supplements like the two-part people do. Depending on your tank volume a few tsp of Calcium Chloride added over the course of a day or two will bring your calcium up to 420ppm or where ever you want it. Some Magnesium Chloride and Magnesium Sulfate will do the same for the Magnesium. If you've been at this since 2009 I assume you are aware of the 'reef chemistry calculator' and articles by Randy? If not I or someone else can find you some links.
Bubbles of CO2 per second isn't a very reliable way of gauging what your calcium reactor is set to. A pH controller set to maintain the internal pH around 6.5-6.6 would make your life much easier because then all you would have worry about is how much flow passes through the reactor.
I've been using a calcium reactor for around 6 years and I find that I also have to manually boost the calcium and magnesium content of my water change water in order for my reactor to keep my aquarium's chemistry optimal. I mainly use Instant Ocean salt but rather than add calcium chloride to it I just add a small amount of a more expensive brand of salt with a higher calcium content. I also add some magnesium salts to my water change water because I find nearly all brands to be low in magnesium.
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