Lots o' air....

[Copperhead]

Replaced the seal on the leaf basket and the seal on the pump basket. Capped off the O2 temporarily. Moved the valve a little to slow the suction at the skimmer.
All of these things helped a little, but I still have very much air being pumped through the system, so much so that the cartridge filter tank continually traps air.
What to do next?
Thanks

 

[JasonLion]

There is an article in Pool School on locating suction side air leaks, in the How To section.

 

[Copperhead]

Thanks, that confirms what I was thinking next, going to see if I can find seals to rebuild the valve.