I am a new pool owner with an underground saltwater pool. I tried several bucket tests over the summer and it appeared I may have a small leak. I have also been losing salt. I installed a solid vinyl winter safety cover about a month ago, and the poll still lost about 4-6" in 30 days. The water level was at the return jets when I took the cover off, but I am uncertain of the level had stabilized there or not. It seems awfully coincidental that the water level was right at the return jets when I pulled the cover off. I did a visual inspection of the jets, screw tightness, and didn't see any problems. I tried a dye test, and it appeared there may have been a very subtle draw into 2 of the 3 return lines, but it was so subtle, it was hard to tell. I checked all above ground plumbing and discharge with no leaks. Is it time to hire a leak detention company? I called one and they quoted $400. I'm in the Charlotte, NC area. Does anyone have any thoughts or recommendations on any further troubleshooting or a reputable leak detection company? Thank you!