Wondering about this myself. They have this at my local Home Depot $20. Need some more base mix but hate going to “grow” stores. It is OMRI so how bad could it be? I plan to add EWC, a couple jobes spikes per pot, some chicken manure and xtra perlite if needed. Trying to build three mostly water only containers for a hassle free bloom phase….I usually get FFOF soil but it is now so overpriced