If you are only needing substrate for a couple of enclosures, why don’t you just get products intended for reptile use? Then you don’t have to worry about any of these issues. The Bio Dude, Pangea Reptile, Josh’s Frogs, etc carry bioactive and other substrates.

I understand why people with large collections might look for more economical substrate solutions. But if you are new to bioactive or other natural type substrates I would recommend going with products made for reptiles while you learn about maintaining this type of enclosure and do further research.