I'm by no means a chemist but it certainly depends how saturated each solution is that you're dosing. I know that if I follow the BRS instructions for my chems...I should be dosing pretty close to the same of each. I'm not sure if your mixes are equal 'strength' or not. Also, for the longest time I was dosing quite a bit more alk than calcium (still do but they're getting closer together) as the salt I use has elevated calcium levels but target alk levels.
Hope that helps some.
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