Question about the soil Green House uses in their grow/test video's

[PHDin420 15]

Can anyone tell us what the exact soil brand or if a custom mix, what the ingredients are to the soil Green House uses when comparing their hydro results with an organic soil grow. They give very detailed info about the hydro grow and nothing about the organic grow except they do mention that they never add fertilizers of any kind. Soil can mean a lot of different things to a lot of different people and results can vary greatly depending on the mix and what's exactly in it. Thanks

[Tokage 2,156]

Not sure if anyone knows that, i mean they never said anything about it. I would guess that Franco and team makes their own mix?

[Crentz 22]

They stated in one grow video rockwool but not sure if that's for all grows.