You are not required to use a GFI breaker on pool pumps located more than 10 feet away from the pool (on residental pools). You need a GFI on pool light circuits and convienence outlets located within 20 feet of the pool edge.
I'm not saying don't put in a GFI - only that it is not code required, and if budget is tight you can skip this step.
The GFI concern/requirement is for those devices where you can touch the electrical device while your "in" the pool/water.
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