The pool at our home we‘re remodeling is about 50 years old. Saltwater pool with liner. We have other concrete to remove and replace for the patio so we’re looking at removing concrete around pool, updating coping and skimmer plus new liner. Going back with concrete. Should we do a bull nose coping or cantilever under a concrete edge? Looking at Latham liner but should we do 27 mil? There is no light in the pool. Is it worth the trouble to add a LED light in deep end? Thanks