Best of luck Anonymous grow...Make those 12 count!!
quoting this post again because we are ordering our soil on monday and i'm still trying to decide on a final mix. We copied Boobs' mix of equal parts (1/3) lava rock, peat, and compostin my opinion you're better off using your own formula and then finding a place to mix it for you, saving you lots of work.
if you buy a pre-mixed ...mix, with a formula 'they' make, they're going to be price gouging you in some way and then stuff you don't want to be in it is probably going to be in it, and even if they say 'this' is in it, not all amendments are created equal, pay attention to quality of the amendments. don't pay someone to come up with a formula for you, there are plenty of great formulas for soil mixes out there. this is how people get taken advantage of imo.
I've heard quotes as low as $2 per yard to mix 'your' mix, so have them deliver your peat, aeration such as lava rock, perlite etc, and high quality compost. (i'm using diestel) to the mixing site that you find. then choose your amendments, I posted the mix we're doing this year a couple pages back.
here it is again, I don't think you can go wrong with this one, similar to the CC mix but with some slight changes.
30% sphagnum peat
30% lava rock
30% high quality compost
10% top soil, this you may or may not do, if you're going to have it mixed at a place then this'll probably have to be screened to filter out rocks, I'd contact whatever place you find about this.
for amendments we went with:
1/2 cup neem meal, neemresource.com
1/2 cup kelp meal, Down-to-earth
1/2 cup crab meal, Down-to-earth
1/2 cup gypsum
1/2 cup oyster shell flour
4 cup rock dust, contact thomas vanacore at rockdustlocal, he knows a good hookup for rock dust in california.
that's the amounts per cubic foot, there are 27 cubic feet in a yard.
if you're on a tight budget you can use karanja meal which is slightly cheaper than neem and also probably cut back the rock dust to 2 cups/cu ft.
ya its sucking in some crap im going to make a postal box intake for it. i also had to lay some wood over the duct cuz i crushed it a few times pulling tarp.