Hi Emerald, there are a number of things that you could do to treat/prevent spidermites.
1) You can make a mixture of rubbing alcohol (70% isopropyl alcohol) with water in approximately 1:3 alcohol to water ratio and spray the leaves and roots with this concoction and let it dry. Spray about every other day for about 1 week or so. There are many different recipes for this type of spray that include adding some ground cinnamon and/or liquid dish soap.
2) Increase the humidity of your growing area. Spider mites do not like to be wet! They normally will show up on plants that are being kept in a dry, warm environment. *This is more of a long-term treatment/prevention method*
3) Spray your plants with the Isopropyl alcohol alone, making sure to get into all crevices. This is a stronger version of option 1, but it also can be a little more harsh on your phal because of the inherent desiccating nature of the alcohol- can affect your leaves negatively if done too often. For this, I would suggest no more than once every 3-4 days MAX.
4) There are various products out there that contain all sorts of miticide agents- some are stronger than others, but at the same time the chemicals that they contain can actually be dangerous to YOU as well! For this reason, many growers tend to lean towards neem-oil or soap based products because they are less likely to harm you in any sort of way. * I personally have discovered "Mighty Wash" from BrewandGrow.com. I have used this on my orchids and also on my vegetables (same growing area)! This product is safe to apply whenever in the growing cycle and is organic= NO NASTY CHEMICALS FOR US! The only instructions for use are that you just need to spray extremely throroughly when the plants are not going to be in any sort of strong light- best applied at night or after grow lights turn off because this solution can cause the leaves to burn if exposed to light before drying.
It only took 2 applications and all of my spider mites were gone! Easiest thing ever!Mighty Wash
Of course, everyone handles mites a little bit differently. But everyone agrees on this- they are a PAIN and it can sometimes take persistance and vigorous observation to make sure that the infestation does not come back.
I wish you luck in your battle against the dreaded mite and if you have any other questions, please feel free to post them here! We all love to help each other out!