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  1. J

    How to calculate change in head with lower HP pump.

    Hello, I measured my current pumps vacuum -7.5 "hg, and pressure 15 psi, to determine head, 43.13'. The current pump is a 1hp Hayward superpump. Looking at the pump curve this puts the flow around 50 gpm. If I were to replace this with a 3/4hp superpump, the flow at the same head (43.13') would...