You answered you own question: at freezing.
At or near 32 degrees F your pump should be turned to keep water moving. moving water doesn't freeze.
It is important that any exposed pipes, filter and pump have moving water at freezing as this water will freeze first and cause the item to crack. That's expensive as compared to the few cents it costs to operate the pump.
Water starts to freeze at 32 degrees. So it best to turn pump on at approx. 35 degrees & leave on until the tempt. rises to 35
The minimum temperature required to keep pipes from freezing is typically around 32 degrees Fahrenheit (0 degrees Celsius).
To prevent your pipes from freezing during the winter, it is recommended to keep your house temperature at 55 degrees Fahrenheit or higher.
I would seriously consider turning it on at 0 degrees Celsius.
At least one degree above freezing?
To prevent frozen shower pipes during winter, you can insulate the pipes, keep the temperature in your home above freezing, and let the water drip slowly to keep it flowing.
To prevent pipes from bursting during freezing temperatures, you should insulate exposed pipes, keep a consistent temperature in your home, allow faucets to drip, and open cabinet doors to allow warm air to circulate around pipes.
There is no single best way to keep pipes from freezing. Insulating (wrapping) pipes is a common method. Leaving the cold water faucet open just enough for a slow drip is another method to prevent freezing.
To prevent your pipes from freezing during winter for 2 days, you can insulate them with foam pipe insulation, keep cabinet doors open to allow warm air to circulate, let faucets drip to keep water flowing, and maintain a consistent indoor temperature above freezing.
To prevent hot water pipes from freezing in winter, you can insulate them with foam pipe insulation or heat tape. Additionally, keep the temperature in your home above 55 degrees Fahrenheit and allow faucets to drip to keep water flowing.
Water pipes can freeze at temperatures below 32 degrees Fahrenheit. To prevent this, you can insulate your pipes, keep your home heated above freezing, and let faucets drip during cold weather to keep water flowing.
Water pipes can freeze at temperatures below 32 degrees Fahrenheit. To prevent this, you can insulate your pipes, keep your home heated above freezing, and let faucets drip during cold weather to keep water flowing.
To prevent frozen pipes during freezing temperatures, you can insulate your pipes, keep your home heated above 55 degrees Fahrenheit, and allow faucets to drip to keep water flowing.