On Thu, 16 Jan 2020 19:09:48 -0700, lowbrowman, the endlessly driveling,
troll-feeding, senile idiot, blabbered again:

The cheap potting soils may have EPS. The better brands have perlite
which looks a lot like ground EPS and is easily told from vermiculite.

I trust that our endlessly blathering senile farmer boy knows something
about this.