Ok have a pool about 10 years old with a liner.has been pretty much trouble free except a few small patches to the sides a few years ago.about 2 months ago was cleaning leaves from the pool with the net.may have brushed it also but can't remember.anyways 2 days later I noticed the water level had dropped past the skimmer.refilled it and stilled dropped.have just let it continue to drop as it is now about 12 inches below the skimmer and seems lose about a 1/2 per day with the pump on.seems to be a little slowe with pump off.we never close our pool and the pump runs 24/7.seems to me like the leak has to be in the liner as that was what I was cleaning 2 days prior to noticing the droppage.no main drain.just 2 skimmers and two lower suctions and 2 returns.also a light in the deep.water level is just below the top of light.also have plastic like steps in the shallow.water is now at the last step.any ideas?