Proper way of mixing sea salt

[africangrey]

Ok for you sps lovers out there, what is your way of mixing salt water. I was informed that the elements in the bag or bucket is not uniform mixed, being that heavier stuff tend to sink to the bottom of the container, so shaking the bucket to mix the stuff inside before scooping it out is a prefer way of making the salt H2O.
I didn't know about this and have been always scooping the salt from the top but haven't experinced any problem so far.

Oh another thing, do you guys add the salt to water or add water to the salt, I've been told to add salt to water but couldn't find any reason to justify this is being a prefer way.