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Yep...Im in Illinois as well and my floor drain survived the polar vortex last year like a champ. It's necessary to blow out as much of the water possible out of the center drain and then slam shut the main drain valve to create an air lock in the piping under the pool. I also like to add a...

The top valve (red, port 1) is connected to your skimmer. The side valve (blue, port 2) is already connected to your center drain under the pool...that valve will then be connected to your pump, then to the filter and ultimately to the pool return. I generally keep the center drain valve in...