Do you turn your pump off to the swimming pool if it is freezing outside?

Assuming you live in an area where pools are winterized and shut down for winter, I would run filter for 45min - 1 hour per day. Be carefulk not to over sanitize the pool because chlorine (etc) demand is very low while water is so cold.

If you expect to experience freezing weather then do not turn your pump off. LEAVE YOUR PUMP ON. Moving water can not freeze. As water freezes there is expansion. This freezing/expansion can destroy your pump, filter and pipes.

Steve Dunn Commercial Pool Systems, Inc.