I have an issue with a new liner just being replaced in my pool. This will be a long post, but I could really use some advice/knowledge. The pool only leaks water when the pump is running(no water is coming out the backwash). The people that installed my liner said that it must be an issue with the plumbing to the pool. The pool was fine last year when I shut it down (no leaks when the pump was running). I had American Leak Detection come out and do a pressure test this morning. I will include a couple of video clips if I can, but I will also explain the procedure they did. So, they plugged the skimmer, and pump basket and then performed their test. I have two return lines, and they capped off both when testing. The deep end return checked out fine, but the shallow end return showed leakage. ALD said that it is because the return fitting is cracked, and that water is leaking behind the liner because they didn't use a gasket behind the fitting. The pool installers said that the liner itself is good enough to be a gasket. To give you an idea of how much is leaking, I have filled the pool to the top screw on the skimmer (the one closest to the top), and let it run overnight several times. In about 10 hours or so, it has leaked down to the lower level of the skimmer inlet and I have to turn the pump off of course. The pool installers seem to think there is a leak in the skimmer line to the pump. It is about a 7 foot stretch of PVC underneath the concrete deck, but ALD says the skimmer line is fine. When the pool is off, the water doesn't go down in the pump basket at all. I understand there could be a leak in this piping, but wouldn't the water level go down a noticeable amount? Also, there is suction on the skimmer line, not pressure, so I don't understand how that much water could be leaking out of this line when the pump is running. Please, give me some thoughts/ideas on what you think the issue may be. If you need additional details, I will gladly provide them. Thanks!!
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