If you are using this Bur-Cam model 506532SS Dual App Pump as a booster pump, you need to have between 20 & 25 PSI on the suction side of the pump. IF you are installing it as a shallow well pump, it will handle up to a maximum 25 foot suction lift. This does NOT have to be a well, it could be a lake, pond or cistern. Two applications, two different installation methods.
If you have any other questions, please let me know.