I don't think you want to use Vulx in a hempy. Maybe with Coco but I can't see it holding, at all, in perlite. I suspect within a couple of waterings, all the Vulx would be in the res. Keep in mind, Vulx is essentially a rock dust product in a very fine powdered form.
It's best for soil grows, and I'm quite confident it WILL help with ProMix - just not ProMix that's already been amended with the high brix kit which (guess what? ) already has rock dust in the amendments!
It's best for soil grows, and I'm quite confident it WILL help with ProMix - just not ProMix that's already been amended with the high brix kit which (guess what? ) already has rock dust in the amendments!