I recently added a 12 mil bubble wrap pool cover to our pool. There are a couple of small gaps, probably under 7 or 8 square feet total. It's regularly in the 80's here, with very low humidity. I'm still losing about half an inch of water or so a day, or more. Could the minimal uncovered portion cause this? I can actually hear the pool gassing off around the edge when the sun hits it direct. The pool water is about 83 degrees, and is rooftop solar heated.
I'm fairly sure I don't have a leak, as I only had to add water once a month or so in winter.
FYI, the reason for the gaps in my coverage is because I had to flip the cover. I cut it to fit with the bubbles up. One day I noticed a bright sheet on the cover, and realized water was all over the top of the cover around the bubbles. I had basically created a nice warm bed to speed up the evaporation! The evaporation has gone down significantly with the cover the correct side down, but I'd like to hear how much other people lose.