Dutch, it's been mentioned here a few times. I'm not saying I believe what's been said, but the more you hear....
I don't know how long snake mites can live in substrate without a host, so an answer to that question might clear things up a bit. Freezing is a good idea. When I used aspen back in the day, I always froze it.
I buy my substrate in bulk, so I always have it in my garage for at least a few months, then I freeze it on top of that.
Plus I Provent-A-Mite that stuff too!
MH
Who the hell is Pat?
"Pattimuss doesn't run, he prances most delicately, like a beautiful but sad fairy, winged and capped, curly toed shoes on each foot, dancing on dewdrops while lazy crickets play soft music for him to keep time by...." - Wes