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May we assume that there was a REASON the GFI was tripping in the first place? If you replace the GFI and it begins to trip immediately, you should call in a qualified Spa Repairman to find out why.
Didn't I offer to deliver some chemicals to you a while back? This would be easier than trying to smuggle chlorine on plane and into Columbia :-).....and I have enough frequent flier miles to make a few....dozen trips