We had record low temps here (single digits and teens) for 3 straight days... Everyday this week I've had to add an inch of water to keep the level above the returns. I kept the pump running the whole time it was freezing so I don't think I busted a pipe. I did not run the skimmer, but the water was filtering the entire time. It's been above freezing for a day and a half now and it's still losing a little bit of water. Hoping I don't have an underground pipe that cracked...