Quote Originally Posted by imfignewton
Use schedule 80 male adapters on the intake and discharge side of the pump, If the pump unprimed the schedule 80 will not melt like schedule 40 will.
From experience I can assure you that with a Pentair whisperflow 1 hp pump you will not melt the sch 40 fittings. My wife did this experiment for me. She set the valve to waste (while the pump was off) and never checked the pool again until I came back from a trip, five days later. So I know that sch 40 can hold up to 8-12 hour cycles completely dry for a week.