It is also possible I have a faulty .memory. I am pretty sure I only drained the pool last fall to just below the skimmer. The return was still in the water, so I rigged up a snorkel for it. Anyway, when I took the cover off today the water level was just at the bottom of the return. So, do I have a leak somewhere? Or will that much water evaporate, even under the winter cover? It did get much colder (like single digits) then it normally gets here. I am also considering that ice damaged the liner.