I have always liked kalk because of its ability to help with phosphate removal. By using both kalk and my co2 reactor, my levels stay at around 420ppm and 12dkh. With the co2 reactor only, the alk stays but the calcium slowly drops. I dont have anywhere near the sps like you,{Brad}, but I do have several hundred pounds of coralline encrusted rock, which is a calcium sucker.
I adjust mine by following the effluent alk. Near 30dkh @ a very fast drip,{almost steady}. My ph monitor is just used to check the effluent output for changes.
Just out of curiosity, what do some of your reactors measure for effluent calcium levels?
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Doug
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