Thank you for the response. I cleaned it last night. Took the filter apart and pulled out the whole thing and using a hose cleaned off all the wet DE. I must have cleaned it for an hour. I then put it back together and turned everything back on in the "Filter' setting. Then I used 12 cups of DE into a 5 gallon bucket and mixed it with pool water then poured it into the skimmer. Pressure remained around 20PSI for about 3-4 hours then jumped to 30. Normally I would think that its just a dirty pool and this is normal. Pool is getting cleaner but is still cloudy and not completely clean. Reason I'm concerned is I suspect I see some air bubbles in the pump and when the pressure jumps to 30 it starts to lose its prime. The water level seems to be a bit lower in the pump. But based on your last comment, it sounds like if it was an air leak problem the pressure would be dropping not rising. So maybe I've just got a dirty pool and it is what it is.