DE Inground Losing pressure

[PoolDoc]

Pressure going quickly from 10 - 20 suggests something is wrong with your filter, and is causing it to clog quickly.

I'd suggest opening it, and taking a look-see to make sure everything is OK and installed properly.

[relvistcb]

ok i'll check it out, i know i put all the grids in proper space and manifold is all the way down, i shall return with update Pool Doc thanks

[relvistcb]

ok i replaced the leaky union after the pump basket, not leaks. Still losing pressure after about an hour then barely anything pumping loses primer, but check the video gauge drops when i shut it off. I know i put the new fins correclty inside the filter with new manifold and it all fit together perfectly no spaces tightened down. No leaks on outside just wondering would the oring inside the filter where grid manifold will make it lose pressure? http://youtu.be/fQvR3swDEzQ