Originally Posted by Mike Leary
Re-think both comments, they are both wrong, IMHO.
Not for S. Florida irrigation.
Leaky fittings & valves are common as a result of our alkaloid soil; they cause a pump motor to cycle night and day burning them out in short order. I've replaced lots of burned out motors and installed lots of timers between the power and the pump to prevent them from continually cycling.
Why would a pump cycle when it has continual demand? If it continually cycles while irrigating, I'd say you have a problem.
Your opinion is probably valid where you live and have worked.
IMHO, demand systems are a PIA for irrigation and the pump should not be cycling on and off continually with a valve open.