I would say this is true for most, but CaribSea has 2 different product lines.
Arag-Alive which is the rinsed, dried, and then packed with nitrifying bacteria (freshwater variety bacteria so not that beneficial)
and
OceanDirect which is straight from the ocean floor and is legitimate live sand, never rinsed, nothing added, nothing taken away, not even sifted I don't believe.
Edit: Here's a video about it by BRS
Years and years . This is how it’s been done .
open the bag , and add to dt .
it will cloud a little but not last long .
What changed to strictly encourage rinsing prior to using ?