2 hp? How big a pool? 45,000 gallons with an attached spa? Wow! Unless it's that scale in size it's WAY too much pump! More HP in a pump is NOT like a car. It's not necessarily a good thing and can be a really bad thing. I run a 1hp 2 spd pump on 19,000 gallons and not only does it work well, it works BETTER on low speed (I have a 200# sand filter). Yeah it runs longer but sand filters do much better when they aren't running near-capacity.
Carl