So for those of you who have seen my previous posts, I know it took me a long time to get this thing properly set up but now I have a new problem. I accidentally ran it dry the other day after over a week of it misting exactly how it was supposed to. I've read that they're designed to not be damaged by running dry, but I put four gallons of water in the reservoir and now it's not misting at all!! Is there a secret to priming it? What could I be doing wrong?