I wouldn't waste water just to clean up a pool. That plastic sheet thing would be reserved for chemical dilution as would be the case with way high CYA where the only decent option is to drain and refill. I saw a neighbor fussing with a big plastic sheet a few years ago and assume that's what they were doing. Idea is to keep the new and old water separated so you get a 100% replacement. You can either find a huge plastic dropsheet or tape or bond several sheets together to cover the pool with a lot of slack around the edges. Fill on top and use a submersible pump to suck from the bottom. I suspect duct taping sheets together, using lots of duct tape, would hold for whatever time it would take to fill the pool. The technique was mentioned somewhere on the old forum that crashed by someone else and I never had to do it or try it. Should work though.
Al (ajs-1)
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