My in floor system works pretty well at 20 psi, but I only get that pressure if the main return is closed. With both returns going the pressure is maybe half and it doesn't effectively push (they barely pop).
Is this an indication that the pump motor is inadequate? Or is it intended for the in floor cleaner to be the only return? It's been this way for 5 years since I bought the house and I always chalked it up to a bad system. Maybe I can address it now that I'm a TFP member.