I have just installed the new Hayward SP3400VSP and trying to determine the proper RPM schedule.
My in ground pool seems to be about 7500 gallons (the size is 25'x10'x4').
At full speed of 3750 RPM the pump is generating about 18 PSI on the filter manometer.
Plumbing is 2", one suction line and one return line.
As far as I understand the approximate formula to determine the GPM is: GPM = RPM/30
So if I want to use 1000 RPM speed, I will get 1000/30 = 33 GPM flow rate and at this flow rate I will need 4 hours run time to pump 8000 gallons ( 33*4 *60 = 7920 gallons)
Am I right in my calculations? 1000 RPM and just 4 hours does not look alot to me, the water is barely moving (however it does).
As a note, I was running the old 2 HP one speed pump for 2.5 hours a day.