Dude, here's a tip: spray everything from the roots to the buds with a garlic infusion, and you'll never have spider mites. It's even more effective to use a UV lamp a few times a day for one minute.
Take it out if you can and wash it with some kind of chemical that will kill the mites then rinse it with water and use it again no reason to buy another if you can kill all the nasties :)