I have a .75 HP pool pump (220V) that I believe is single speed and I'd like to replace it with something more efficient. I've attached a picture of the motor label. I think it's a Sta Rite pump, but I can't find a label. I'd like to go either 2-speed or variable speed. I have a booster pump for the sweeper and no fountain, solar, etc. to run, so I'm assuming I can stay fairly simple.