I put back everything and i can see water coming through the pop up system, but it doesnt popup, may be i need to change the plastic pistons.
Now the pressure seems to be at 35psi. I think I really need to change all the grids or may be atleast clean them thoroughly. How do you know when to replace the grids? I replaced 3 of them since 1 was torn and 2 were broken by poolguy.