Pumping the water into the plant for desalination by hand is slow and inefficient. The plant's old computer contains the schematics for an automated pump, but only a mechanically-skilled character can understand the schematics.
I downloaded the schematic for an automated water plant into my PipBoy from the Jericho water plant's pump control computer.
I built an automated water pump for the water plant in Jericho. The plant should be able to produce fresh water a lot more quickly and efficiently now.