Bob,

I just installed a 1 HP Shallow well Jet pump/pressure switch fed from a pond for a 6 zone irrigation system.

The pump is cycling. Some zones have only 4 spray pop-ups and some zones have 6 rotors.

The CSV calculator tells me that I need a CVS1 but how do I know whether I need a 30, 40, 50, etc? Before I adjusted the pressure switch, cut in was 20 and out at 40. Now it is approximately 30/50. ( I did this by slightly tightening down (CW)on the differential nut.)

Thanks,

Ros