That's pretty absurd. This mix is only as good as what you make of it to begin with. I've amend a shit load of castings, lime and perlite -pretty basic when using any other peat-bases mix when soil growing bud.
Did you bother to amend the mix with anything?
What microbe killing fertilizer salts are talking about?[/QUOTE any fertilizer salts.why do you know of any organic fertilizer salts that feed the microbes? I dont have to use lime soil-less mix has a lower ph than soil so lime is just going to raise it and my water runs over 7 out of the tap. it has enough perlight in it already. If you like the stuff buy it. I had a pallet full of bails I think i have 4 or 5 bails left. one more thing about the promix you cant stake anything down because the soil is so light. and grow bags are not a good idea for this stuff because it rolls the soil away from the edges if you have to move them.