I bought my pool last May. I opened for the first time in March. It has been running fine. I noticed yesterday the water was low, close to the bottom of the skimmer basket. I put about 4 inches of water in it. This evening when I went to go look at the pool the water level was right back down to the bottom of the skimmer basket. That was about 7:30 pm i noticed that. I looked in the pool to see if i could see any holes in the liner and i didnt see anything. I removed the steps and looked behind them. I looked around the pool to see if there was any puddles of water or wet spots. I do have rubber mulch around the pool but i pulled it away to look underneath. i really didnt see anything. im putting more water in it and will look in the morning. What should i do?