I have lost at least 1 inch in water level in the past 24 hours. I have only owned this pool for one season and have noticed that the water levels would drop more than normal evaporation. There appears to be a leak somewhere in the under ground plumbing. My pump and filter are set up inside my garage and there are no leaks around that set up. In the past 48 hours my water level in now below my skimmers. Are there any tests that I can do without calling the expensive pool places? Any help or suggestions would be greatly appreciated.