Denanbob - I don't have the expertise to tell you what to do here so I won't.

I was thinking about this some more and if the pump is double insulated then I don't believe that the bonding wire connects to the circuit ground back to the panel.

Anyway, if lightning hits an AG pool, it's made of metal and it's sitting on the ground so the lightning has a direct path to ground through the pool so it shouldn't need to flow through the ground wire back to the panel. I don't think a grounding rod would provide any more safety in the case of a lightning strike (or other situation). If it did then why wouldn't the electrical code (article 680) specifically call for it?

Peter