Everyone, thank you for the replies. Very informative. It looks like I will be going with a Vertex Pondlyf aeration system. Vertex will be getting back to me with their recommendations. Our biggest hurdle is trenching 900ft of poly tube from aerator to the manifold by pond. This due to the fact that we will be trencing through heavy timber. We are not sure how deep to bury the line. I found some 5/8 inside diameter tubing that would cover that length with only two couplings. Has anyone had experience trenching through timber? Also, Vertex recommends using 1 inch tubing. I'm assuming thats outside diameter. We were planning on burying it about one foot deep to keep the animals from burrowing down and chewing on it. The entire 900ft is downhill.