A unit of pressure used to measure water pressure in irrigation systems; optimal pressure ensures even dripper flow across all emitters.
Dakota measures 60–70 PSI at the pump and 40 PSI maintained system pressure during testing. He notes 40 PSI as 'perfect' for the drip system. The 60% PSI figure is referenced when running the first full automated feed through the CO2 room drippers.
Discussed in: Ep 004