Does anyone know the lowest GPM needed for the Aqua Rite SWG to still work? I am trying to run my Intelliflo at the lowest possible RPM, outside of when heat is needed (which goes to 2350 rpm). Soon, the weather out here in the desert will require no heat source (other than the blazing sun) so I plan on running the pump 10 hrs or more per day at a very low rpm to save $$. of course, i want to make sure my SWG is still working, however. Anyone know the minimum GPM for the Aqua Rite SWG?