"A soil-less mix fortified with Turface, sand, and granite grit is a good general-purpose mix for many plants," https://nargs.org/reference/troughs#sthash.BOHYRv7e.id21AnuC.dpuf
I've got lots of Turfaceand granite grit, but when I asked for soil-less mix at the nursery, everybody looked blank as if they had never heard of such a thing and said, "I don't think we've ever carried that." We were standing in front of a display of various little (read: expensive) bags of "potting mix." But isn't potting mix (as opposed to potting soil) by definition a soil-less product?
When I lived in another state (it was also in another century) I would buy bulk quantities of a soil-less product called Pro-Mix BX, but I haven't seen it lately. The only bulk mixes my local nursery carries are Berger BM1 and Sungro Professional Growing Mix, and the employees didn't know if they were soil-less.
Can either of these products serve as the base of my planting medium?