If I was doing it, I would run one main line (3/4" or 1") to a small valve box near the shore. Then I would run two valves. The sinking line would start at the valves and go to the diffusers. Make sure to put a PSI gauge in line at the pump. If you do not bury the main airline it can be a pain to mow around, get chewed on by rodents, etc. If you do bury it make sure not to pinch or puncture it with a rock when you cover it up. I used black poly 80psi pipe for my main airline. It comes in big rolls. Lay it out straight in the sun for a while and it's easier to work with. The 80PSI stuff is pretty dang tough and affordable. .


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