Well, I re-read the Intex instructions and I think perhaps I've been doing it wrong - still not positive because their instructions clearly say to open the vent 1.5 turns and never expressly say to close it again for opertion. I know when I open the vent screw 1.5 turns I get tons more out-flow. However, in speaking with someone at work they think my way was working better because I was comparing it to operation of an un-primed pump. Tonight I'll close the vent back down being sure it is primed to see if I lose out-flow. Good thing you didn't listen to me -- but then again, my filter gets dirty, my pool is clean, and I have good out-flow so I'm not sure yet if I've been doing it wrong or not.