My bad cocoWhat medium? I've used substra in rockwool.
I'm using canna coco in coco now. Is there a reason you want to run substra instead of coco?
Gotcha ,I ran some left over subtra through coco for a few weeks and plants did fine. I think you'd be good running what you have there. Never used facilitator but read many good reviews.Just what I got from a close friend. I usually run New Millennium in coco. I'm not to familiar with Canna products.