Is the pool built already? If it is not then have them plumb the piping runs with 2" piping which can handle the flow better. I have a 2.5 hp 2 speed pump with 2" plumbing and on high the flow is actually more than I would like for my small pool. I got stuck with my large pump when I requested a two speed pump and that was the only size that was available. As a result I only run it on high to prime or backflush and at startup when the water is cruddy. I switch between high and low speed with a switch located on the back of the pump, nothing fancy. I am curious as to why they are installing such a large pump for your pool, do you have a spa? Make sure that they provide you with some way to switch between low and high speed. Any half decent electrician that works on electric motors should be able to wire the pump up correctly. Good luck.
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