Jinky,
Flow is Ltrs per min, amount of water.
Preassure is pounds per square inch PSI.
If you turn on your garden hose fully open with nothing on the end a lot of water will come out but won't spray very far
Iff you put your finger over the end you INCREASE the preasure but REDUCE the amount and the spray goes further and, when washimg the car, rinces better.
Jouk has put figures on jet sizes which relate to AMOUNT of water
Jet size Amount Preasure
1mm Low High
1.5mm Med Med
2mm High Low
Fan jets have a simular effect of increasing the preasure and reducing the flow but also spread the water.
We ought to commision a Universety Study (The suppliers should ) so as we could develop the most efficient and effective system.
David