I do not dose alk and calc separately, but I do dose kalkwasser as my primary means of maintaining my water parameters. I run the kalk doser 24/7.
Here is a link to an article on my dosing setup.
https://drive.google.com/file/d/0B5QJJLprX7aQclZsN2pyLU1zTU0/view?pli=1
Thanks,
Bruce