We are in the process of building a deck around our above ground pool when we noticed the concrete blocks that the pool is sitting on are wet on he back side of the pool. We just recently built the pool and I just started running the filter yesterday. Late yesterday my husband noticed that one of the blocks was a little wet that is the base to one of the columns for the pool. This morning all the blocks for each column along the back side are a little wet. One is especially wet. Any ideas other than a leak? It's a brand new pool with new liner. The water level doesn't look lower.