I guess that if you are running electric underground, in most places, that would require a trench that is below the frost line, so laying an air hose instead should not create a freeze problem. I have some 2" poly line that I hoped to use from the compressor to the pond edge, and then choke down to regular weighted aeration line. It would seem that any water in the line would not cause that much resistance compared to the water above the deffuser in the pond. I am no engineer and would like to hear from one if I am thinking right?