My pool has some eyeball jet fittings that need to be replaced. Some have completely come off leaving behind a bare exposed wide open PVC pipe end while others have broken off in parts and partially remain attached to the pipes. The pool is about 10 years old, is in ground, and is concrete (diamond brite). I cant really tell how these fittings were originally installed but I'd like to know what exactly is involved. I'm sure that the pool was empty when they were first put in and I'm wondering if I'm going to have to lower the water below the returns to do this or if there's some 'shortcut' for doing this underwater? Also, what would be the best / recommended way to remove the old eyeball fittings if they are still partially (or even completely) in place? Perhaps if I'm going to replace a few, I might as well replace them all.