Thanks. I checked when I got home and the pump is a Hayward SP4020. Says 2.0 HP; 1.35 SF, 2.70 THP. Figure pool is around 15000 gallons at 3' deep at shallow end and 5'deep at other end. About 35' x 15' bean shaped.
Also noticed the flow switch quit working today. We have an Aquarite swg...