I have a large 10 yr old gunite pool which has been leaking for some time, however with the moderate earthquake in Va last year, it has been leaking more. About 2-3" overnight. Leaking stops about 6" below the normal water level.
All of the skimmer and return lines have been pressure tested. No leaks found at main drain, pool light, or in or around skimmer boxes. There is no equalizing valve.
At this point we're down to 6-7 vertical hairline cracks in the sidewalls at various places. They are so fine you can't get a fingernail to catch. The cracks start about 4" from the normal water height and are 12-20" in length.
If we have covered all usual potential leaks, we're just left to wonder about those cracks, and can imagine that at least in theory, they could be leaking that much.
No doubt the gunite is covered by some kind of plaster. Nominally this is a black pool. Actually it's a dark grey. Close inspection of the covering shows lots of small gray granules packed tightly but smoothly together. Some may call this a 'quartz' finish.
If others think that amount of leaking from these cracks is possible, what's the best repair process to follow which will not be unsightly?
Thanks for any tips!