Originally Posted by TheOscar
I would still rinse it out.. I wash everything going in my tanks .. Regardless
Which is fine, but for the sake of the OP, it is an unnecessary step to take. If he uses play sand or anything else, then yes, I would recommend washing it until the cows come home but PFS has such a minimal amount of dust due to the fact of it being made for filters. At most, put it in the tank, fill the tank part way, swish it around with your hand, drain the tank, and done.
I'm giving him a very easy option and at the same time educating him on why it's such an easy option.