From what I can see, You can use a j hook or unibead liner with the coping piece you have. Your coping just sits on top of the “j” or “U” but the “j/u” sits on the pool wall correct?
A regular beaded (hung) liner would require a bead receiver piece placed directly on top of the pool wall in which the liner would snap into.
Some people choose beaded/hung liner’s because you don’t need to remove the top rail to replace them. This comes into play if you have/plan to have a deck. A unibead can be used either way.
Like most things, above ground swimming pool liners have changed over the years. Back in the day when I started building these things, there was really only one type of liner available and it rarely came in any color other than solid blue. You just had no other choices. If you got an above ground
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