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An inground swimming pool with a spa ,light, filter motor , circulating motor and disinfectant light is served by a computer controlled sub panel with (3) 2 pole 20 amp circuit breakers and (2) 1 pole circuit breakers. None of these are GFCI circuit breakers. GFCI protection is from the main panel by way of a 50 amp 2 pole GFCI . Is this correct

Everything is still GFCI protected, whether the GFCI protection is at the service equipment/preceding upstream panel or whether the GFCI protection is at the pool panel.

Protecting the pool panel is good.