Stuff can hide on LR
for a longgggg time before you see it.
is shipped moist, but not submerged in water, when shipped this way, somethings make it, and then of course, there is some die off as well.
I think maybe it's itty bitty tiny water bubbles shooting out, not salt ... check your return box/sump and see that your return pump water supply isn't getting low, Maybe time for a top off? Also, sometimes they will pump faster than it can return... I had that problem.. I added a huge rock to raise the level of water and I was fine. Just an idea.