If you drain the pool (at least most of the way) the liner will eventually float, and continue to tear over time, but it's just going to be trashed anyway, so that's not a big deal. You'll stand a much better chance of getting a good liner fit if they can see the bottom clearly enough to make sure the measurements are right. If we were only talking about a few days, I might say go ahead and drain it, but 3 weeks is a long time. Of course, I'm no expert on installations, but we do have some around the forum and hopefully one of them will chime in soon.
If you have a high water table it's possible that the pool shell might float, so I wouldn't drain it completely--I'd keep at least a couple feet of water in the shallow end, but you can bleach what's left and stir it up with a broom or something to clear it enough for them to see the bottom.
Janet
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