My liner collapsed in this year so I'm shopping for replacements. I bought the house with the pool, so I don't know the brand. The pool is 18''. The existing liner is 48''' beaded. My pool is dish shaped, with the middle being deeper. Do they make liners for that? The only expandable liners I've seen are overlap style. Or is it more like that this dish shape was just something that happened over time and it was flat originally? It's a fairly large dish, so I would have thought the liner would have torn apart if it wasn't specifically designed for this shape. Or should I just flatten it out and get a standard beaded liner and call it a day.