Let me preface my comments by saying that I have used American Leak Detection in the past for regular plumbing leaks and this is what they are good at. They are not a pool company.
I noticed that the 30+ year old pool was leaking water after having a leaking pool fill valve replaced. The equipment was so old it was also leaking water above ground. I called American Leak Detection which is the only company listed here on Angie's list as explicitly being able to provide pool leak detection in the area with any recent reviews. I spoke to Felix.
Was told by Felix that the pool had to be clean, the equipment functioning properly and the water level at normal levels for them to check for leaks. The leak was so persistent that it had leaked to below the skimmer opening before I added water again. I told him this.
The equipment was leaking so much I could not get a good vacuum seal to be able to clean the pool well enough for the technician to dive in. Marco was the technician. I told him that the water had leaked two inches below the skimmer opening when he arrived. On 3/5/2014 He tested the spa jets, the pool return, the inlet line going back from the skimmer to the equipment and said that the lines were not leaking but that the skimmer was separating from the pool wall and leaking there. He said that although it could be fixed with epoxy, he wanted to dig up the entire section of the pool around the skimmer and replace the skimmer throat. He quoted me a price of $1770-$1870.
I also said I was going to get all the equipment replaced and a new gas line run in for the heater. He said he could do that and would go get an estimate but never got back to me. I called American Leak Detection again and spoke to Felix, letting him know that I was going to go a different direction for now and would call them again when I had everything broken above ground fixed.
In the interim, I hired another company who is the highest rated pool service company in the area on Angie's list and had all equipment replaced, new gas line run in, etc. The replacement equipment includes a state of the art pump. They did a fabulous job. I had the water return set to 50% spa, 50% pool. I noticed that when I set the return to 100% spa, the water level did not drop but if set to pool, it was losing about 1/4 inch -1/2inch or more per day. I ran the system for a week with no water loss with inlet set to pool skimmer and return set to 100% spa jets. I called American Leak Detection again and spoke to Felix. I told him that I was still chasing a pool leak and could they continue their investigation. I told him he could send a different technician and was told that Marco is the only one. Marco came back on Friday 4/4/2014. He retested all lines, could not find any leaks. He went into the pool and said he could not test the light fixure without breaking it. He said that the bottom drain should have a spring loaded check valve but it wasnt working. He recommended to replace it but did not say it was leaking. He mentioned the skimmer again, saying that the epoxy job was not smooth. I said as long it is not leaking I don't care if it is smooth or not.
When he left, the pump was on for its afternoon 3-5PM daily timer setting. I added some water to bring it to the tile line. The next morning I checked at 8AM, the pool and the spa had lost two inches of water. I contacted Marco. He said he would find out when he can come back. I shut off the equipment so it would not run over the weekend. So far, the pool has lost 6 inches of water. Whatever he did made the problem worse, because now it loses water no matter what. It is Monday, I have not heard from anyone at American Leak Detection.
Will provide an update when I see how this plays out.
Update 4/14/2014:
Because I was continuing to lose so much water so fast last week, I could not wait for any return visit by American Leak Detection. I hired a real pool contractor to make the repairs. The problem with the last visit by Marco is that he triggered the massive leak while trying to test the check valve in the bottom drain. He was down at the bottom of the pool a very short time holding his breath. Without either emptying the pool or using a scuba tank it is not likely he could have changed the check valve anyway. The spring on a check valve is on the top of the valve. The fact that there wasn't one meant that it had corroded away. Opening and closing the valve with all the debris down there made the problem worse.
I am neither impressed with nor satisfied with what was said and done by American Leak Detection in this case. Follow up was very untimely, the problem was clearly beyond the tech's knowledge. While there are certainly cases where a skimmer replacement might be called for, the mere fact that the original leaking problem had leaked well below the skimmer opening on day one but they want to focus on it feels like a bait/switch that would NOT have solved my problem which is why I did not let them do it after the first visit. Since the paper work clearly states that their service is guaranteed, I feel I should get a refund.
Final update 4/15/2014:
My leaks were all found and fixed by another company. The valve in the bottom main pool drain was a metal hydrostatic valve, not a check valve and was actually partially plastered over after it was originally installed. The main leak source prior to the hydrostatic valve leaking non-stop was a broken line between the main drain and the skimmer. This is most likely the source of the original leak. The spa drain also had some small leakage around the drain throat. All leaks have been repaired by my new contractor. The pool was drained, the light fixture was checked and reseated no problem, the hydrostatic valve was very difficult to remove (30+years stuck in place), the useless but leaking line between the main drain and the skimmer was capped off, everything is working and nothing is leaking now.