I have some Pascalite clay. I bought it because it will prevent a brown recluse bite from becoming necrotic (sp). I don't think we actually have brown recluse spiders but we have hobo spiders and they are almost as bad. I hate spiders with a passion and where I live they come as big as mice, or so it seems to a chicken like me.
I'll check out wrens postings about it. I've used it on my dog before when he chewed a hole in his back and I was drinking it for a while, but I don't remember why. LOL