I do not know about these discs, but your tank/housing does not seem sufficient at all imo. It should be bigger first off, and should be able to fit two hides. One on the cool end one on the warm end. This will help the snake thermoregulate.
Just a suggestion. And if what snakehunter is saying is true, and your snake doent have mites to begin with then this will only attract mites from outside and causs your snake to get them. Imo, really pointless and doing the opposite of its job.