I have a 30K gal gunite pool with a salt system and Polaris and I just put in a Pentair Superflo variable speed 1.5HPpump. I set my pump for 3000 RPM for 12 h and 1400 RPM for 12 hours. Is this the most efficient setting or can I use a lower high-speed RPM? I live in Georgia and run the pool year-round. With my old single-speed pump, I ran it for 12 hours during the day and turned it off at night. (In the winter when freeze possible I ran at night.)