$5 rescue phal with mealybugs

[greenpassion]

Hello all. Yesterday I went to a little shop up here where I live and they had phalaenopsis orchids who's Bloom's had gone by priced at $5. I picked up a beauty with double spikes very healthy root system. I got her home though and happened to notice on the tip of one of the spikes was what I understand to be a mealy bug. I picked it off found another pic that off and sprayed it with Bayer 3 in 1 insect and Disease Control Spray. I have her currently isolated in another room from my other orchids. I'm thinking despite the media not looking broken down, that I should repot her with clean bark in a different pot and spray her again. I'm hoping to get her back with the general population obviously free of bugs! Any advice? Is my planning plausible?