I purchased a house with a pool in need of rehab. The liner has been replaced, new pump, refreshed sand filter, and pressure test with no leaks (after 10 years of no use). I have concern that the coping is going to be an issue. Can I fill the gap between this coping and the concrete deck? If that will help, what should I fill it with? Obviously, with a new liner I’d rather not replace the deck and coping. Would have been nice if the company that installed it would have been more forthcoming about future concerns. The gaps between are no greater than an inch. Thanks!