My pump is in an ventilated enclosure about 20 feet from my pond. I run 1/2 inch irrigation tubing out the bottom of the enclosure and into the ground. I buried this pipe about 1.5 feet down. When I buried it I was very careful to keep it sloping gradually toward the pond and then along the pond bottom with weights. It enters the pond under water about 1.5 feet below the surface. I carefull sloped it because if you get low spots in the pipe it could collect condensation from the pump which would then freeze. The pipe is obviously not deep enough to avoid freezing. I have never had a problem with freezing. I have no flowing water in my pond, it is simply excavated in low ground. I run the aerator on a timer, 4 hours starting at midnight and 4 hours starting at noon. I would caution to remember that my pond is basically figure 8 shaped. I run aerators in both sections in the summer but in the winter only in one section. I truly fear that if I ran them in both sections, or if my pond was just one round pond rather than two sections I think I might have to run the aerator much less to keep the water from super cooling. I would be very careful. I am pumping 5 CFM and when it gets below 0 deg. F. it is not enough to keep an open hole with my running schedule. But it does keep a rather large thin spot. I installed my aerator the year before I stocked fish and spent one winter just experimenting with the aerator schedule to determine the amount of run time. That would be the best approach but if you already have fish I don't know what I'd do. You could kill them all if you run it too much.

Gotta get back to fishin!