Quote Originally Posted by hrst View Post
Anyway, my point was that with 1 liter kit you certainly can mix it all at once. It is so much easier and "safer" that way against any kind of measuring errors.
Well no, that's the whole point: mixing everything in once & thus being "safer" against measuring errors doesn't mean much if the manufacturer hasn't been accurate to start with.

If I mix a possible next packaging in one go, I will first measure the contents of each bottle, in order to safeguard against measuring errors by the manufacturer. I'd consider that the safer method.