Our inground pool is 18' x 48' x 10' deep. It has a liner.
I have been fighting a huge leak for almost a year. Last summer, we lost 4 inches of water every single night. At the end of the season, we let the pool just leak until it stopped. It stopped 4 inches below the light and did not move from that spot for months. A pool expert came over to assess the situation and immediately said the leak had to be in the drain line or in the liner. He did a dye test all around the pool and decided the leak was not in the pool.
Going on the assumption that the leak was in the drain line, this weekend, I drained all the water out of the pool. I plugged the drain, connected a pressure tester to the drain line and just knew that I would finally find my leak. I would simply cap both ends of the drain and fix the leak.
To my absolute shock (horror and continued despair) the drain line is holding the air pressure. I can't believe it. I am totally at my wits end with this. Professional leak detection told me to expect anywhere from $800 to $2000 for them to find the leak last summer. This should not be rocket science and should not cost this much to find the stupid leak.
If the liner isn't leaking and the drain is holding air pressure - how could we be losing hundreds of gallons of water each night - and literally see no signs anywhere of water in the yard or the area around the pool?
Can someone please help me?