+ I think if you slid towels under the edge of the pool, they might absorb enough water to allow you to localize the leak. That is, the towel near the leak OR near the path the leak follows on its way out from under the pool will be the one wet.

+ Regarding buying used -- you and your seller were much more likely to puncture the liner during the take-down, transport, and set-up process, than during use. He might have punctured it unknowingly, or you might have done so.

+ As W-M suggested, don't let it get slimed. It's hard to clean up algae in any pool, but it's nearly impossible to do so in an Intex, due to the small filter. You can KILL it, no problem. But getting out all the particles that cloud your pool is very difficult.

+ . . . membership updated.