I think I have a leak in my spa, hoping somone can help me figure out what is going on. I have a inground pool spa combo with a waterfall from the spa to the pool which runs during regular pool operations. In addition, I have an autofill valve as well. Over the past two months, I noticed my water bill was significantly higher, so I did some testing. First, I ran the pool/spa as normal, but turned off the autofill valve. I was loosing about 1 inch over a 24 hour period. Bingo-That was the reason for the high water bill. Now I think I have a leak somewhere the pool. To test this theory, I turned off the waterfall feature and ran the pool as usual. Over about 2 days I may have lost about 1/4" of water from the pool. Good news-pool seems to have no leak. However, with the waterfall turned off over that period of time, the spa drained down to just about pool level. I thought maybe there was a leak in the lines that run the jets in the spa, so dug up several areas, but no signs of a leak. Where is the water going? Does the spa have a leak in the drain? I have scheduled a leak detection service to come out next Friday. They want $425 to do the leak detection, so hoping someone on this forum can help me figure it out before I have them come out.