We opened our pool a bit early this year for Ontario, Canada temperatures. There have been days where the temperature outside overnight has gone as low as -7C (20F) and I'm just worried if we will be damaging our plumbing. The most extreme it's been is -7C (20F) for 2 hours and -5C (23F) for about 7 hours. It's been consistently -1C (30F) for about 15 hours some nights/evenings, this has happened for about 5-7 days. During the day temperatures are usually at least 5C (40F). Our pool water is sitting at about 9C (48F). We have had the pump on since we opened on April 1st. Should we be worried about pipes freezing?