I'm pretty sure permethrin ((nix)) isnt organic, as it seems to be more chemical according to this research
http://npic.orst.edu/factsheets/Permtech.html
so I wouldn't reccomend it for snake treatment unless it is EXTREMELY diluted
also it seems that the 'Mite-Nix' you are looking at is an allergen suppressor, meant to rid places of dust mites and allergens