No not promix brand. I started using these about 2yrs ago after watching a canna cribs episode and the head grower talking about sterile grows each time. Meaning no reused anything. So i emulated that. New grow bag, new promix hp, fresh aged manure, worm castings. Always fresh and new for every grow or transplant.
This is
150 bags. I love how i can toss them in a drawer.