Jason
I have the same reactor as you have. On my 280, I have got to the point where I don't count bubbles or measure volume of effluent any more. I just watch for a constant dribble out of the effluent tube and a bubble rate of about 1 per second. That keeps my Ca up around 400 ppm and alkalinity at 10 dKH. I also use a kalkwasser reactor in line with my dosing pump. You may want to measure the 2 parameters for the first while until you figure out the Ca demand of your system.
Andy
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