My new sulphur denitrator setup

[Psyire]

Well if your drip rate is too fast then it will not function properly and if it is too slow you will get H2S created in the reactor... so that's probably not a good idea.

Your Ca production will also flucuate with your nitrate level reduction so it would be very difficult to get it constant. (unlike a CO2 bubble counter w/ solenoid control)