That is very daring, putting a pool all the way in the ground. The water you are refering to looks like it could be just natural ground water, I am sure that it was a problem all along and not related to the pool. Did he put in a wellpoint somewhere next to the pool for you, so that you could pump out the ground water in the event you have to ever change the liner? You would need to or else the pool could collapse when you drained it.
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