Open pool - something is wrong, jets, pump, filter

Hi,

Water condition is good, clear and nice.
Only CYA should be added, all others are normal. Will do overnight.

After shocked, I cleaned filter once again, like disassemble and cleaned etc. Put it back, now pressure steady 18 psi.

I don't have manual, neither can find on internet this one. May be will recheck model once again

Only one thing, once filter pump starting returns throw out some dirt and sand, not very long, but it happens.
What it cause?

Thanks.

PS: I have a spa with plumbing problem deep in ground. Once pool will work for me will do the spa :)
 
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