Recently I have been losing a lot of water, about 1” daily from my pool. Doing some investigation with some phenol red in a syringe I found that water is being lost around one of the return jet fittings. Not from the plumbing but the area where the body of the fitting meets the pool surface. The dye very quickly is getting sucked in. All the other jets seem fine. There is also a small area of missing surface around the jet. (See photo). Not sure what exactly the surface is but it’s a textured concrete type of pool. Maybe gunnite? Should I try sealing around the body of the jet with an underwater epoxy? Or bring in an expert to look at it?