We are new to the pool closing. We need to know in an area that freezes at night only typically, should we close the pool or keep the pump and filter running t all times? We are confused because pool guys have said different things. We have the gizmo in pool skimmer, lowered water below skimmer, and run the pump only when just above freezing. We have a freeze guard on pump that starts pump if temp is below 38. Is this right or should we just fill it back up and let the pool.run through the winter without lowering the water at all.