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    adding heat pump doubles filter pressure

    Was happy to find this thread. We just added a Raypak 6450 to our setup (hayward super pump 1HP, Hayward 200lb sand filter) and saw the pressure jumps from ~12-14 PSI to ~20 PSI when going through the heatpump. I was paranoid the installers mucked it up, or something was lodged in there!