Sorry, if I offended you . . . but I've worked with too many electricians who couldn't wire a DPDT switch for a 2 speed pump, for me to take anything for granted. Here's the connection drawing:



Based on that drawing, yes, can toggle between high & low, and switch speeds. Remember, that you need a 15A MOTOR or INDUCTION rated switch. And, if you place the switch external to the motor, you need to attach a warning label indicating that the switch does NOT disconnect power to the motor. Intermatic has a DPDT time clock you can use, that's not much more than an SPDT clock.