I have some spots under the liner close to the wall that the sand is washing out. We did a dye deal to try an find a leak but no dice. Here is what I was thinking. The bottom of the pool sucks. You can tell its not as level as it should be. It was not installed by a good company(out of business). I was going to drain it down low enough to fix the sand washout. But decided to wait till winter an drain it and fix the bottom. Now I have been told that if i drain it I will have to replace the liner. Is this correct? That is why I was going to wait.