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Thread: Keeping DE from flowing back into pool

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    Keeping DE from flowing back into pool

    When I clean my salt cell, the water flows backward from the filter into the pool, dumping de and other stuff through the skimmer and into the pool. The filter is a PacFab FNS Plus 48 and has a backwash valve that you twist and pull up to put into backwash mode.

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Keeping DE from flowing back into pool

    You might have a valve that blocks the water flow somewhere around the pump. If so, closing the valve before opening up the SWG cell would solve the problem. If you don't have a valve like that your only choice might be to backwash the DE filter before opening up the SWG cell.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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    Re: Keeping DE from flowing back into pool

    Aside from the backwash valve on the filter, the only valves I can see are the jandy ones that control whether water pulls from and goes to the pool or spa. If I just open the backwash valve, but never turn on the pump, just open the cell to clean it, will I still need to add DE? Thanks.

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