let's step back for a sec..i have a starite pump and the plate that has rpm on it has the max gpm on it. (i.e. mine says 48gpm for 3/4 hp pump) ...also, the other huge variable is the size of your fittings. i can tell you right now if you have 1.5 inch fittings, maximum gpm you will be able to run through it regardless of pump horsepower is 44gpm...it's simply as much volume of water you can push through pipes that size.
i have only the pool to pump (no spa) and 1.5 fittings so really, the 3/4 hp is perfectly mated at maximum 48gpm rating.
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