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I have a 33 year old Anthony 20k inground gunite pool with a small attached 300gal spa, level with the pool. (not raised) both the pool and spa share the pump and filter. Spa has a venturi system, with the venturi air line sticking out of the ground by the filter pad. There are 3 return jets and a main drain in the spa (main drain is usually valved off unless we're using the spa, which is seldom). The pool has 1 skimmer, 2 return jets. The spa has a small spillway which dumps water into the pool. Pump is a 4 year old Pentair Intelliflo VF which runs 24/7 at 15GPM/1 complete turnover a day (130watts). The pool is always clean and crystal clear with no debris on the bottom. I run the Polaris every night for 2 hours. (it's set up on the time clock) Now that you all know the stats of my pool, I have a pesky leak that happens every year around the same exact time - around December and tightens up with no leaks a a month or 2 later and will continue to hold water all summer and fall until next time. I've done "the bucket test" every time this happens, and the pool can lose up to 1" in an 8 hour time period. I've had 2 leak detection companies scratching their heads and unable to find a leak. I've had everything checked: hydrostatic valves, pool lights, skimmer, plaster imperfections, Aboveground plumbing. Aboveground plumbing is tight and no leaks at all. When the first week this December came around, it was losing 1 1/2" a day. I rolled my eyes, did the bucket test and started to keep a log trying different things: It lost water with the equipment on, didn't lose water with equipment off. Isolated off the spa and ran the pool, no loss at all. Isolated off the pool and ran the spa. This thing is dropping an inch an HOUR. So apparently, the leak is in the spa. I think I found it finally! It's definitley a return jet...or IS it? My question is, is it possible for the pool and spa to lose water through the venturi air line? At times when the pool/spa is just running at 15 gpm, the venturi air line is full of water to about 8 inches down from the top of the opening of the pipe. When I call the leak detection company to check it, should I have them check that venturi line as well? If so, what's the best way to do that? Plug the opening and the jets?