Want to upgrade pump to save $

[GaryT]

New here. Appreciate all the pool wisdom. I have had a pool for 39 of the last 42 years in different houses. Every year I discover something new - usually as a result of a new problem. So this year the problem is the electical bill.
I currently have a Sta Rite 1HP pool pump serving a 20,000 gal pool operating 4.5 months per year.
Figure I can save kilowatts by changing to a WhisperFlo 3/4 HP 2 speed.(Could use the model number if available)
Is this a good move or is there a better one?

Pump is 65 feet from pool, elevated about 2.5 feet.
2 inlets; one return. All 1.5 inch ID

Thanks, Gary

[PoolDoc]

Yeah, I've got Amazon links to what you probably need . . . but first, I need to know what filter you have. Exact make / model / size, please.

[GaryT]

It is a Cristal-Flo Model T-240BP-1 Hi Rate Sand filter
Surface area 3.14 sq '
Flow rate 20gpm
Filter and Back wash flow rate 63 gpm
Max Press 40 psi

Thanks

[CarlD]

Ben will give you more precise advice but I have a Hayward 1hp 2spd Super Pump with a 200# sand filter and 19/20k gallon pool and I run it most of the summer on LOW about 12hrs/day. I run solar panels with 240 sq ft of surface area without problem (equal to 3 20'x4' panels), even on Low without a problem....pool is crystal clear today.

Carl

[GaryT]

Any more advice?

[mas985]

The Whisperflo is a powerful pump even at 3/4 HP so it will probably exceed the recommended flow rate of the filter. However, the 3/4 HP uprated SuperFlo (SF-N2-3/4A) will produce around 47 GPM on 1.5" plumbing which would be close to ideal.

BTW, which sta-rite model number do you currently have?