Hello Myriam,

Thank you for your question and trust in our products. Here is the answer to your question from our Product development team:

"The antifreezing will start automatically once the filtration is in auto-mode or timer-mode and the default temperature is set at 3°C.

If an air temperature sensor is connected in addition to the water temperature sensor, the first one will automatically detect a temperature at 3°C which will launch the filtration for an hour. As long as the temperature does not reach out the 3°C, the filtration will keep working on one-hour cycles.

It is important to remember that an active wintering works better in areas where freezing temperature are unlikely (e.g. Southern Europe) but not without risk. In fact, if a freezing period occurs, you can experience power outages that wills top the filtration so you have to stay aware of that fact and keep monitoring the filtration as the freeze will most likely damage some of the pool components."

Thanks,

The Pentair Team