In reply to Teri-I am experiencing daily significant allergy symptoms even though we have already experienced a few times of frost; along with the feeling of increased mucus that I can’t get out (I’ve always been a dry cough person-reason why I have a vest). I don’t seem to be feeling bad, but do I need to be concerned about bacteria build up? What do you think? Thx for listening and hope things improve quickly for you😊