If you’re a pool owner living in or near the Greater San Francisco Bay Area, it’s time to start thinking about winterization. You’ve likely heard of people who drain their pools for the winter, or perhaps you’re one of them. But should you drain your pool for the winter in Northern California? Is it really necessary? If not, what does pool winterization entail? For that matter, is it ever necessary to drain a pool? To get answers to these and other questions, we spoke with Mike Doucette, general manager of Roger’s Pool & Spa Service Inc. in Sebastopol.