No two systems are the same. Start yours at low RPMs and increase by 100 until they come on. And also find where the weir doors are bobbing along (skimming) and any other functions you may have.
Add 100 RPMs to each function to account for slightly less flow as the filter gets ditty and that's the minimum speed needed for each function.
You run the lowest speed that accomplishes what you need, then raise it when need be to heat (etc)