OK. Unless that pump has a capacitor, the calculator is showing VA, and not true power. PF for fractional inductives seems to range from 0.75 to 0.9.

And, your 2150 GPH rated pump pumped an actual 1560 GPH, or about 75% of it's rating.

This is one reason it is so hard to optimize residential pump + filter sets: the engineering data is missing or wrong!

Still . . . this is all very interesting.