Question about Hayward 1HP Super Pump II Inground Pool Pump

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Hayward 1HP for in-ground pool: When I shut the pump off sometimes DE backflows from the filter through the pump and into the pool and accumulates on the bottom. The pump is about 10 years old and it just started doing this. It happens often, but not every time. Nothing else has changed in the pipe/filter loop. What might the cause (and fix) be?

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Usually caused by a small air leak somewhere on the pressure side of the system. A check valve on the line coming out of the pump going to the filter will solve problem.

Posted on May 05, 2010

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