Damn J420, where do you live where you can't get any good substrates Africa ? I live out in the boonies too, I have reused my organic mix for years. Nothing fancy, but I keep adding to it year after year. TBS... I don't put seedlings in that mix until they're jammin in 3-4 weeks. The thing that bothers me about sterilizing any substrates, is now you must add everything back to the mix to make it good again. Do what you gotta do for this grow !!!! You're prob using synthetic nutes . After this grow, I would change to organics, and reuse the mix year after year. It's fun, and you'll learn a shitload about plant growth.