Ok... at firt thought the pool liner was floating because of watershed from a hillside next to the pool seemed like after spring rains it would dry up and the liner would go back in place. The sidewalk is hallow underneath along side the pool . Which is why we thought it was the rainwater. This summer we removed the landscaping along side the pool and found no drain tile or anything for the rainwater to escape and we also found a leak in the corner by the steps we have repaired it and started to pump the water out from behind the liner We dug some holes next to the sidewalk and water has filled the holes This morning the water behind the liner is the same level as the holes we dug and the pool ( The pool dropped after pumping all night about 3 inches ) Should we keep pumping from behind the liner while we fill the pool ? Or what do you think is going on ?