How do you dispose of used pro mix? I assume it isn't reusable? I'm building one of the aeroponic tubs GMO uses, so I don't keep having to deal with getting rid of used dirtI tried growing in cocoa, using the slit buckets that I’ve been using. I’ve always had a problem with the leaves, looking deficient while I was using the cocoa. I finally went back to using pro mix and have never looked back. I’ve never gotten any bugs in it and it’s totally inert.