Ca reactors are designed for maintaining a certain Ca level, not increasing it.
(Now before anyone says I'm an idiot, yes you can increase the Ca level, but that's not why you use a Ca reactor)
Questions:
1. Tank size?
2. Age?
3. Stocking levels? (SPS/LPS not fish or inverts)
I use both a Ca & Kalk reactor.
My suggestion to you:
1. Turn the co2 off for the moment.
2. Adjust the effluent output to 1-2 drops/second.
3. Over the course of the next few days adjust with additives
(not using 2 part supplements) your Ca to 420-450 Mg to 1300-1400
and allow you Alk to drop to your desired level of 9-10 dKh.
4. Once these are stable for a few days, now turn your co2 back on,
and set the bubble rate for 1-2 bubbles/sec.
5. pH inside the reactor should be 6.5-6.7 depending on your media.
6. Adjust the bubbles up/down to maintain the pH in the reactor. Don't
adjust the effluent yet.
7. Monitor your levels, it should start to stay stable.
8. Depending on you Ca/Alk demands, you might need to tweek the drops up a little, but you will also have to increase the bubble count to maintain the 6.5-6.7 ph inside the reactor.
9. If one level drops but the other is stable, just add a little to bring the level back in line.
Once you Ca, Alk, and Mg are in the range I stated above, they will all work together and become stable.
