denitrator

[Delphinus]

I don't really see any problem with hooking the two inline, except for the fact that you lose the ability to adjust the flowrates of each independently, which may or may not be a headache - I'm not sure. Typically, as time goes on, calcium demand tends to grow, which may dictate an increase in flow in the calcium reactor, potentially overwhelming the denitrator. So it may not work forever, but there's no reason no to try it in the meantime.