There are a couple of ways to get to GPM for the Intelliflo. If you know the wattage that the pump is drawing, the link labeled "Pump Modeling Tools" in my signature, there is a spreadsheet which relates GPM, RPM and watts.

If you don't have a power reading then I can make guess for you based on some additional information.

Pipe size and number of runs pool to pad for both suction and return.

Filter PSI at a given RPM, preferably at a higher RPM.