I have similar distance. I ran 200 ft. of 10-3 w/ground and doubled up the hot side. Then 100 ft 1/2 in. semi-rigid PVC. I had a fence to put insulators on. I find the electricity somewhat near the pond useful for bug zappers, small water pumps for herbicides, trimmers etc.
ML and Ewest, can't he do with a smaller compressor in 8ft at 1/2 acre? Lewis, you will need 1.5 to 2 cfm at minimum 4psi to drive 1 diffuser. I think a 0522 series compressor will be plenty, just check the specs.
