[BroadHopper]

Everyone is right, Do not use pex piping where it will be expose to sunlight. What I have done in the past was bury the pex pipe between the pump house and down to several inches below the low water line. I usually leave the pipe in year round relieving the pressure during the winter months by dismounting the pipe at the pump. After several years, you will fine the pipe will harden and crack. I simply replace the pipe with a new one.

I never had trouble with the ice in the winter. I believe it freezes inside as well as outside the pipe so there is even pressure, preventing the pipe to burst.