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During prper winterization, the water in the bottom drain is usually "blown" out with compressed air. How this happens, is that a pipe with a schrader valve (the same type of valve on a ture intertube) is inserted into a pipe that is threaded into the pipe below the skimmer (with the leaf basket removed) An air compressor is then used to fill the tube with air. The air forces the water out of the entire pipe. Bubbles will come up from the drain when all of the water has been blown out of the pipe. The pressure of the air being in the pipe keeps the water from flowing back into the pipe. Hope this answers your question.

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Q: What happens to the water in the bottom drain pipe after winterizing an in-ground pool?
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