Mine is IG, but I can't see that it's much different.....I run my pump for a couple of hours daily (most days), and if it's going to get below 30 degrees overnight, I run it overnight just to keep the water circulating. We rarely have more than 2-3 nights in a row where it gets that low, though. (I'm in Louisiana). I've never had any problem with doing it that way, except that you either need to take your pressure gauge inside, or plan to buy a new one each year--once it gets wet and cold, it sticks and is useless anymore.

Janet