simming pool gas heater and pool pump

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I need to know if the green wire (ground) is screwed to the metal box and to the switch and plug to pump green screw on them and then run back to the gfci breaker box ground that box with wire to the box or the neutral bar, and then run the ground to the main box which is right next to gfci box, ground it to the metal box or screw into the neutral bar on the main breaker box?