I also have to keep my spa overflowing into the pool. When I lower speed too much I get a weak overflow or I have to close my pool return valve more flowing very little through them. (i have 2 full sides that overflow into the pool). Im not far off at 1350 which gets me 28gpm. I could probably drop to 1300 and save a few watts but were probably talking a savings of less than 2$. If it was pool only I think I could get away with closer to 1000rpm
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