Just getting ready to break ground on a new IG gunite pool. Here are some specifics:

Pool size: 24 X 33 (approximate area = 485 sq. ft., approximately 16000 gals.)
Pool depth: 3.5 x 5 x 3.5
Filter: 60 sq. ft. Pentair DE
Pump: Pentair Whisperflo - 2 HP (high performance) - 2"
Valves: Compool -never lube 2" - 2.5"
Skimmers: 2 Bermuda Pentair 2" lines (separate line, separate valve)
Inlet: 5 pool return inlets
SWG: Pentair Intellichlor 40
Heater: Pentair Minimax

I am concerned about high energy costs for running the pump. I am seriously considering a two speed pump or possibly the new Pentair Intelliflo 4 x 160 multi-speed pump.

While reading through many posts on this forum, I have noticed other pool owners are operating smaller HP pumps for pools larger than mine.

How can I be sure that I do not end up with an oversized pump even if it is two/multi speed?

Thanks for the help. This is a great forum.

Liz.
Houston, Texas