Great Idea. I am sure it will work as over the winter when I cover my pool and we get a rain it displaces the pool water. When I siphon off the rain water, I have to add water back to the pool. Just cover with cheap plastic, fill then cut holes in it and pull it out by section... new water in pool to replace old ???

I am in the same boat and have been draining about 4 inches, refilling, letting the pump run to circulate and repeat. This seems much more effective.