Since we don’t normally have a need to winterize our pool, I put 2 tarps over all of my equipment to hopefully trap whatever heat the motor generates. So far, all plumbing is intact. Temp was -2° this morning and hasn’t hit 20° in a couple of days. Power has been cycling off/on ever 30 minutes or so. Thank goodness it’s been on long enough to keep water moving in the plumbing before it freezes. 2 more nights in the teens and then hopefully this is over and all equipment survives. My salt cell is no long giving a reading, but hope that’s due to low water temp.