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Explain your pumping system to us. Is your pump lower in elevation than the surface of your pool water?
I suggest you read through Pool Care Basics - Trouble Free Pool and even look at a few of our videos TFP-TV - Trouble Free Pool
As Marty noted above, it depends. If you have an AGP and the pump is below the waterline, you have to plug the suction port first. If you have an inground pool, you should be able to.
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