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Backwash valve is leaking by. More than likely it is a bad oring inside the valve. Or it was not place back into recirc mode completely.

or

you may have a leak on the return side of the filter. That includes all the Plumbing from the filter or heater to the pool. The back wash valve may be obvious if the waste line ends close by. The back wash valve should be placed in the "filter" mode not the "recirculation" mode.

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16y ago
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18y ago

No, turn the filter off so that you do not forget it and drain it past the filter and burn it up.

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Q: Do you know what the problem might be if a swimming pool drains when the filter is on?
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