That's what I'm thinking too. The o'ring on the basket looks sound-but I guess it's worth changing. I changed an o'ring on the impeller diffuser that was distorted, thought that would help, found that the four housing bolts connecting the pump to the basket were a little loose but tightening them had no effect.

This morning I backwashed the filter (did it yesterday also-this pool is still dirty from just being opened), re-applied DE and the pressure came up fine and for an hour or so, it appears to be pumping like it should.

Thanks.

JB