1.5" poly pipe should be fine. Bury it deep enough to prevent frozen condensation in the winter. I used 1.5" poly for a 600' run from my pond to my GAST 0523 in the barn. Be sure to put a check valve and pressure gauge on your pump. Doing so will prevent backflow and aid in troubleshooting any airflow problems. Protect your pump but give it good ventilation. And, put it somewhere its constant hum will not annoy you or your wife (the most important advice).
I recommend a simple pvc manifold at the pond, so you can easily balance pressure between diffusers should you add another in the future. I buried a lawn sprinkler valve box to house my manifold. Use weighted airline to run from the manifold to your diffuser. I also used some gray conduit to protect the airline because my water level changes quite a bit and the airline becomes exposed. I ran the conduit through concrete blocks to keep it on the bottom. Hope this helps. Good luck.
Last edited by dg84s; 06/20/17 01:35 PM.
