This is my first spring with a PUP, bought our NTU Jayco last fall and was able to get out and use it for one long-weekend before having to put it away for a long Canadian winter. Before parking it for the season I brought it to the dealer that we got it from and had them winterize it (which, AFAIK, only included anti-freeze) mostly because I was new to PUPs and wouldn't have known where to start. Since then, I've spent the winter researching and figuring out that there are a lot of things and can be doing myself. One topic that I haven't seen a whole lot of time spent on is De-Winterizing. What does it take to de-winterize a winterized PUP? Do I just fill the water tanks and flush the system a few times?