You can see the problem, I worked in the masonry business for years and my father still does, so the repair itself should not be a problem, but not really sure what to do, My personal thought, was to counter sink some long tapcon fasteners through the coping and fiberglass into the concrete decking and use some kind of colored sealant for waterproofing and aesthetics after using a chopsaw with a diamond cut off wheel to remove the broken concrete and patch new concrete tying it to the old and sinking some rebar straight down.
The cheap patch stuff is from the previous owner the same one who threw pucks at the pool the more green it got, then if that didn't work went to the pool store/ wal mart and bought the shiniest box or bottle and dumped the whole thing in not joking im related to him. Also after changing the filter,i noticed the spider piece that held the laterals someone tried to repair it with elmers glue.
Back on topic.
The cheap patch stuff is from the previous owner the same one who threw pucks at the pool the more green it got, then if that didn't work went to the pool store/ wal mart and bought the shiniest box or bottle and dumped the whole thing in not joking im related to him. Also after changing the filter,i noticed the spider piece that held the laterals someone tried to repair it with elmers glue.
Back on topic.