Ok, so my pool pump is dying and needs to be replaced. The problem is that it is extremely old, about 30 years, and pumps were not nearly as efficient at moving water as they are now. I am trying to decide if I just put in a new pump with the same hp if it will be ok, and not too much GPM for my system (sand filter, piping, etc.).

Can someone help determine approx how much Total head pressure resistance is in my system (without expensive tools)?

Old pump: Pac-Fab Hydropump (Model: WE 700) 3/4hp
System Piping: 1.5" I believe
Pool size: 30,000 L or 7800 gal
Piping distance from skimmer to to pump: 45 ft horizontal, 7 ft vertical
Pool has 1-skimmer and 2-return lines
Pump runs all the time during summer.

Sand filter specs 17-in I think (it is old also):


Specs for the motor of old pump:



I am looking at putting in a Hayward Superpump 3/4hp and am concerned it will be too powerful for my system to handle.

THANKS!!!!!