When we moved into our home, I quickly joined TFP and read a lot. We had a 25k IG vinyl with some older equipment working fine with psi of 16-20. The system was:
Filter - Stay-Rite S7M120
Pump - DURA-GLAS II P4R6E-151L but with A.O. Smith USQ1152 1-1/2 HP Up-Rated Pool Motor
2 Incoming 2" lines...