You cannot bring snake mites in on substrate unless it is kept in a place with snakes. They cannot complete the lifecycle with out a snake somewhere. I use an organic coco coir product I get in bulk for a organic greenhouse. I am fussy, the farmer is insane. There are no mites or insects or eggs of insects in the stuff I get it is baked at the production facility during the compressing stage. Then vacuumed sealed. I don't know what coco husk product they are referring to (there are many) but ground coir that is compressed is often baked to get the moisture out and to kill an insects it might have in it. I find small stones from the grinders but nothing else.