My first post... so be kind. I am trying to determine what the head pressure would be at the pump in the example in the attached image. A brief description: Pump will be placed in workshop 500 ft from pond, with 1" dia buried poly pipe to manifold at edge of pond where dia will be reduced to 2 separate 100 ft 5/8" weighted air lines running to 2 Vertex XL2 diffusers 10 ft deep. Will the pressure be 5+1+.4=6.4 psi? If so a Gast 0523 pump should give me ~3.8 CFM to drive the two Vertex diffusers. Or will the pressure will be 5+5+1+1+.4=12.4 psi? If so, I will need to choose a different pump.
