Click & Grow Bug Infestation

Our 4 week old Click & Grow Basil pods are sprouting nicely, and suddenly we have a tiny white bug infestation! How to get rid of them? Don't want to use chemicals as we plan to consume the basil, and cannot rinse under water faucet since the pods are encased in the Click & Grow housing. We live in CT and it's winter (about 12-20 degrees outside, and 67 degrees inside). Where did the bugs come from - non-sterile soil? Helpful tips appreciated!