I have a 48" sandblast cabinet that I only recently put to use (long
story).

This cabinet has a blower and a filter bag.

It is full of fairly fine sandblasting sand.

My question is, if I run the blower while sandblasting, will that
blower pick up only dirt (such as blown away rust, paint etc), or will
I also experience loss of sand itself?

Does that blower pick up sand?

thanks