I have my own cow and I do not pasteurize my milk, except for making yogurt, which otherwise turns out slimey. I eat my cheeses fresh or aged, but I also drink my milk raw and prefer it that way.
However, I do milk my own cow. I know my cow's history and how she is fed, the immunizations and medications she's had, and how clean I am in my milking practices.
As you are getting your milk from a large dairy, you would have to make your own decision on that.
I've never had to use CaCl, so I can't answer that for you.