A newly potted phalaenopsis should be able to remain in its growth media two years before repotting. When there are many, long roots over the edge of the pot, this plant has most likely been growing for several years since its last repotting. If your plant is not currently in bloom, you should repot now. Be sure to remove all dead roots that are usually dark-colored, soft and mushy. Sometimes they may be dry, with a fiber running through the middle of the root. Center the plant with all of its roots down in the pot and add moistened bark until the level of the bark is just below the bottom of the lower set of leaves. Wait a week before resuming your normal watering and fertilizing routine.