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Chances are your housing has sand scratches. An impeller will wear in if the pump ingests sand. The rubber will form to the deep gouges over time and continue to pump some. Slip in a new impeller, and the firm straight rubber will bridge the gouges and will not self prime. These pumps are a positive displacement design and need to pump air for a few seconds in order to adequately wet the suction network, prime fully, and pump to capacity.  W

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