I don't know much about booster pumps except that they boost pressure very well. Question is, can they boost flow (gpm) much? Residential system. HO added booster pump for whole house. Said neighborhood pressure had gone down in recent years (maybe added development) and water authority did not help. Seems that most zones (12 total ) work very well with the pump. One problem zone has 4 PGP rotary heads (#7 nozzles) along with 3 Hunter PS side strip heads at the curb. My pressure gauge at valve box hose bibb shows 30 psi, and I calculate about 14.3 gpm via nozzle sizes. Meter (in basement) is 3/4" copper supply and 5/8" meter. Other zones flowing at mid/low 40's psi. All while booster pump is running. Incidentally there is (was) a zone with a single spray head on it (for a 2' x 2' bed at garage). While it runs, booster pump brings pressure to just over 90 psi. If the problem zone is turned on first, not all the PGP heads will pop up w/o assistance. But if the booster pump had just been on and it had raised the pressure, then the heads will pop up. But not strong. Heads turn slowly. I did separate the 3 sprays (added to single spray zone), leaving the 4 PGPs on the original zone. Heads pop up stronger , seem to flow faster, further etc. Pressure while running is 40psi, booster pump is on. Flow via nozzle charts should be 12 gpm. I woulda thought the booster pump could have provided enough volume and pressure for the 4 PGPs plus the 3 sprays. I suppose there could be a flow restriction in that particular zone. Or maybe there just isn't enough water available in the water main? Thoughts ?