Air getting in from somewhere

[Timmy]

I have the exact same problem. Mine is a DE EC65 filter though. Pump runs great before night, I leave it on overnight and when I wake up there is no pressure at the returns and the basket at the pump has very little water. I just had all my lines replaced because I moved the filter. I do not see any leaks above ground.

I thought all the air should be forced out through the jets and eventually the entire system would be all water, no air. Last year I had a problem in the beginning of the season with pressue. What I did was remove the pressure gauge and use this wand attachment for a hose that allows you to clean the inside of the filter. I washed the entire inside down allowing any caked up DE to come out the bottom. Seemed to fix the problem. My thought is maybe this is creating a blockage.

Not sure what a multiport valve is, but I do not think I have one. Could the problem be a leaking cover over the basket at the pump? Not sure if there is a gasket there, I think the previous owner of the house just used some sort of sealer in a tube.

Here is a picture of my filter setup.