We bought a house in July that has an inground pool with a pretty old liner. It is stained, faded and ripped/disconnected at the edges in a few spots (above water). My question is - if there are no underwater leaks, how long can we let the liner go before risking possible damage to whatever is underneath the liner? I am worried that minuscule amounts of water/debris will get under the liner and rot the fiber glass or whatever is underneath it. On the other hand, the pool is swimmable (if not pretty) and we'd like to wait a couple of more years so as to not have to finance the liner replacement. Any insight?