New pool owner here... I'm in SE PA USA, we don't get super cold winters, but do spend a month or two with temperatures below freezing, and 0 degrees F isn't unheard of. We have a whole house generator, so ignoring the potential for a power failure that stops my pump, would there be a significant problem with leaving my pool running all winter? Will the pump circulation and salt be enough to keep the water from freezing, and avoid any significant negative consequences?