I am certain that you great people are sick of replying to liner leak threads, but I'm at my wit's (and wallet's) end.

Made the mistake about two weeks ago of sending the husband out to do the heavy lifting for our opening: leaf removal. He has ripped that liner somewhere. The pool is 16x32 inground, and water loss when full is 4 inches per day. Much slower loss now, but there is only 4 inches of water in the shallow end. I can't let it go any lower, so I can't see where it stops leaking. (I called American Leak Detection when it first started, and they are coming out on Thursday.) I had hopes that it would be the light fixture, and I went ahead and replaced the gaskets in and around the light since I had it out, but it just kept right on going. Then I plugged the hole on the main drain to rule out underground pipes. Nope. I have used up a bottle of Phenol Red checking the bottom of the stairs. No dice.

I suspect that the leak is in the shallow end somewhere, but I absolutely cannot find it! I managed to run main drain only and get the water cleaned to its normal glass-like clarity, and I've gone over every single corner around the pool and every square inch of the floor of the shallow end on my hands and knees. Hell, I even went to a local dealer who carries my liner, and he gave me a sample sheet so I could use it to make the patch look better.

At this point, I guess my questions are:

Have I done everything I can do? Any other tricks that haven't already been mentioned on this board?

Could a bunch of pinhole leaks cause this much water loss? Seems unlikely to me, as the liner is only 4 years old, but still...

Does ALD have equipment that will help them find it? We had a leak three years ago in one of the shallow corners, and ALD found it with a pair of goggles and a bottle of dye. I'm pretty sure those tools aren't going to work this time.

Thanks in advance--I've learned an awful lot from you guys over the years, and as always, I really appreciate it!