Need help with liner

[Alexgreenhill]

Hi guys.
The liner in my inground pool is detaching near one of the skimmers and I'm wondering what I can do about it. Obviously, I need to drain the water out so it can move. It looks like the white edge of the liner is supposed to slip into a notch of the white piece behind it. Is that true? If that's what I need to do, I'm thinking of dribbling some sand into the opening to raise the bottom a little bit right there in the belief that if the bottom were at the right level, this wouldn't have happened.
The upper wide white piece is set into the concrete and doesn't look like it is removable.

Anyone know how these things work? Thanks in advance.

 

[Newdude]

So the liner has a thick hook like bead that nestles into the liner track, with the other half of the hook. Check the bottom of This link for a visual.

the bead looks good and not torn/ripped. Massage it back into place from the outside edges in. The friction from rubbing it will help it be more pliable. Once in place, buy Liner lock for $25 and wrap the whole pool in minutes. It simply pushes in the keep the two halves of the zipper from coming loose. A paint stirring stick or rubber mallot and small scrap piece of lumber can be used for any stubborn / tight areas.