Well somehow the water got behind the beaded liner, and inside the inner pool wall. Now could it have been the installers fault? Very possible, for when I talked to my installers, they had another customer who got their pool the same time I did, and they having the same issue, and they live not too far away. My installer was also amazed I was having this issue, for they have been installing ABG pools for over 30yrs, and have seen them last for over 20yrs. All I know is all around the outside of my pool walls, it looks like tiny pinholes, and rust stains running all the way down the bottom of wall from each pinhole. You can run your hand along the inside of pool, and feel the roughness of the walls. Ive been very good at keeping my water level where it needs to be, and anytime we had heavy rain, I would always backwash to lower water level. The funny thing is that its the whole pool, and not just in one area, so maybe the liner had a defect. Now lets hope I have better luck on this pool, and enjoy the summertime festivities. We need some big time warmth to get our temp to where we need it to be..