Air in lines and unstable pressure after cleaning filter

[Mm_putnam]

Update...
I believe the air was coming from the skimmer somehow. I know this as now that I managed to let a filter sock get sucked through skimmer port and thus clogging that line the pressure has leveled out, pump sounds normal, and filter pot looks to be full of water.
I'll start a new thread on my filter sock fiasco to see just how bad a situation I'm in now.

[BigDave]

Is your water level low? Does your weir door work correctly? Perhaps your were sucking air through skimmer by draining the skimmer faster than the water could flow in.

Strange fix though, I'd like to think I wouldn't have done it that way, but, chances are I will.

[Mm_putnam]

I got the filter sock out of the line and hooked the skimmer back up and all seems OK now. I worked on lubing the neoprene fitting where the skimmer ties in (it's a retro-fit skimmer so I can attach/detach it) and I don't think we're sucking air any longer.