TOD is only part of a complete action plan in treating mites. You will need to clean out the enclosure completely and frequently. Spray the inside of the enclosure with TOD without the snake in there. Then add a very large water bowl (picture a snake bath tub) to allow the snake to completely submerse it's whole body.
The water and the substrate should be changed every 1 or 2 days. Probably spray the enclosure with TOD every 4 or so days.
Make sure to check your other snakes too