Shortly after installing my pool (July 1st) and filling it (July 1-4) I noticed it wouldn't hold water past a certain height on the 2nd day of filling and promptly walked the perimeter of the pool to investigate. The sand I had put on the outside was pooling water around a certain area so I got in to investigate further. I quickly found a hole in the brand new liner (wasn't from install) about the size of my thumb in width. The "split" was horizontal the only vertical wall seam in the liner, about half-way up. Due to it's location, and how delicately I installed the pool & liner, I can only imagine that it was a manufacturer defect that only came to light once pressure was applied (filling pool). Once it was discovered, I got to the pool store at once and got a patch kit and immediately patched the hole. However, due to it's orientation next to the lap seam, I feared it would never hold. It appeared to hold, enough to continue to fill with water and start enjoying the pool. Here we are a week later and I'm noticing a small puddle of water outside the pool on that side daily and suspect that I'm losing roughly a gallon or more an hour ... hard to measure. Any way, here is a video I made in order to get my warranty claim started ... however, I can't find my warranty card right now with the serial number, so filing the claim might be an issue. Any ideas on how to resolve this without replacing the liner? As you can see, the horizontal gash butts into the lap seam, so getting a complete seal is proving to be hard. I currently have 3 patches overlapping, the bottom one is butted up against the vertical seam and the other two above are lapping that one.