You got this part right.It's hard to every cost justify a calcium reactor but at some point the convenience of not having to be continuously mixing and refilling 2-part adds value to me. Just not sure where that point is.
I love my Geo reactor.
My Ph is stable as well as my alk, cal and mag.
I check my reactor Ph every day. Takes 3 seconds and im done, unless I need to make a slight adjusment to the effluent flow because it has slowed.(usually once a month)