Yes, running air though 1/2 inch poly water line is far cheaper than electric, and you don't have to bury it deep, just a few inches below grade if at all. Cheap and easy to fix if you spring a leak, and not prone to lightning damage either.
Very luckily I have quite a bit of water running through the pond even though it is frozen more than 15" right now (I cannot get my bit plus extension through!). I have a long ways to go though to see if anything has made it or not. No thaw for us :-(, at least for the next few weeks. Arg!
I swam in the pond two years ago this date.
