I'm newer to smoking, but am confused about the water pan. I have a MES 30" smoker, and use the Amazen Pellet Smoker, and the recommendation is to not use a water pan with that setup. What exactly does the water pan do, and what am I missing by not using it for my smokes? If I don't use a water pan, should I be mopping my butts and briskets? The MES is a nice smoker, but you sure lose a lot of heat every time you open that door, so I don't mop. But maybe I should be using a water pan? And still, I've seen a few other people recommend sand in place of the water pan? What does sand do? See, I'm confused and need some guidance here. Thanks.