I would think that if you had tears in the liner, you would have noticed a significant amount of water loss, and that it would have gotten worse as the years went by. When I had 3 small tears in my liner last year, I was losing 1-2" or more every day in my 18 x 36 IG.
The liner experts on this forum may come by and say something different, but in my experience I would think that you'd know it if there were tears.
Janet
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