Never have had any reason to use the recirculate position on my multivalve..........(until it was 106 here back to back days.) Could've had a crawfish boil in the pool I think.
Screwed in my aerating flower head to the return and set the filter on recirculate for grins. WOW! Talk about gettin' some air! If that doesn't cool it down I don't know what will. I'm gettin' 5 to 10 feet over the roof line with the pool buried 2 feet!