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all six stations come on at the same time
Have Hunter Pro-C controller, Toro/Flo-Pro solenoids that twist on/off. When the system comes on, all six stations come on.
Sounds like whoever winterized your system left them all turned on
Make sure the solenoids are tight ( Just twist with you hand untill it's taught you don't need to crank on it)
If if has a bleed screw / switch Make sure the bleed screws are turned off