My pool spa is controlled by jandy aqua link rs8. I want to buy a variable speed pump like the Intelliflo but I'm concerned about what equipment I need to buy. Obviously my existing controller does not handle variable speeds. I see they sell a circuit board to handle that and it attaches to the rs8 but that seems like a very expensive option when i I am wondering why I can't just buy a totally new controller. What I'm having trouble with is figuring out what I need in addition to the pump to to control the pump from a controller.