hi. My set up is pool with build in spa, 2.5hp whisperflo, spa has air button on the side to step on and turn the spa on, heater and old intermatic timer model rc2163e. i would like to replace the pump with intelliflo vs . question is, will it wiork. im worry about the timer, i know the pump has its own timer, but if i use that and set the old timer to run 24/7, how the pump timer will know to run full speed when the spa turned on? sorru ot os so confusing, or will i have to run it on the old timer and be able to only use one speed?