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This has to do with gravity and syphoning. If the pool is lower than the jaccuzzi the water will naturally flow downhill once the pump is no longer forcing it uphill., There should be a "checkvalve" installed on your pool equipment to prevent this. Inside there is a rubber seal or gasket. They do go bad from time to time. Also only takes a small bit of sand to get wedged in there and for it to remain opened allowing water to flow back into the pool.

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Q: Why does the water drain back to the pool from the jacuzzi when filter system is off?
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