The problem with Spider Mites is ... they are damned hard to get rid of. If left to their own, they will ruin an entire crop in no time. If you want to get rid of them for good, buy a product called AVID. Its expensive, but some grow shops sell it by the 1/4 ounce. Five (5) drops in a quart of water, placed in a spray bottle will do the trick. Spray under the leaves, on top of the leaves and spray the inside of your cabinet. If you have a seperate clone area, check there too. Always check any gifted cuttings before you bring them into the house. You may need several applications of AVID before the mite problem is over. They get into the nooks and cranies of your grow cabinet. All eggs have to be killed. Also, after your normal yardwork, change your clothes and shower before tending your "indoor" plants.
Vi