2 speed switch

[greenough1]

Hi,
I have a 1.5 hp full-rated single speed pump (SF = 1.47) that I want to replace with a more effient model. It's for an in-ground 15k gal pool and 500gal spa combo and 2 in pipe in/out.

I think I've figured out the pumps, but need some guidance on controlling the speed (high/low). I'm considering the dual speed pentair whisperflo, full rated 1hp.

I have an intermatic control center model 2004 with a mechanical timer. I'd like to just add a switch so that I can manual go to high speed for the spa. I've not seen such a thing. I've seen timers for controlling the pump, but just need a switch. There are at least 2 knock-outs in the box that are free.

Thanks,
jeff