Hi Don, are you definitely sure you have a leak? I am assuming you have a liner? If you are certain there is a leak somewhere, the easiest way to figure out where it is is to search the bottom floor with goggles on. LOL. We had to do this as kids. The liners will have issues after about 5-10 years. If you can find it, you can patch it but finding the hole can be the hard part. One question...is there a spot that an automatic vacuum (if you use one) gets stuck when you aren't around? ie: does it get stuck around the ladders and sometimes you have to move the vacuum by hand? If so, that should be the first place to look for a hole because the vacuum wheels wear down the liner in that exact spot over time. Hopefully the water is still warm where you live to be able to swim and search! If not, you can always rent a wet suit. Another thing we had to do as kids to patch the hole. haha. Good luck!
There is some good information here:
I found these ideas to help
Hi is it a vinyl lining you have in your pool?
Fill an old ketchup or mustard bottle with colored water (food coloring) squeeze the colored bottle near a spot you think may be a leak. If it is leaking there, the colored water will go into the crack. Unless you have obvious cracks, chances are it is leaking near drains or jets. Good luck
The Ultimate Guide To Finding & Fixing A Swimming Pool Leak
This is a very comprehensive article: https://www.wikihow.com/Find-a-Leak-in-Your-Swimming-Pool
Hey Don, hope this helps out,
Hi Don: Check these sites:
Hi Don. Your pool will naturally lose some water to evaporation, some to splash-out and some to backwash wastewater. You will also gain water from rainfall. My rule of thumb is that if you're routinely adding more than two inches of water to your pool per week, you probably have a leak.
Have you contacted a pool professional? They might be able to assist and check out the lining
Here is some info https://www.pinterest.com/pin/40180621648658339/ but I would contact professional
Let it leak until it stops loosing water. The leak will be found at that level! Go around and check carefully. Good Luck!
Thanks John, I am in the process of doing that now.