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Thread: new filter shooting DE into the pool

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    new filter shooting DE into the pool


    Brand new pentair FNS DE filter. Today when the pool filter started I saw DE enter the pool through the returns. what gives?
    18,900 Stonescapes Tahoe Blue xtra black, 8 jet Spa, Pentair inteliflo VS , Pentair FNS 60 DE, Inteliclor40, Pentair 400,000 Mastertemp heater, 3 spillovers powered by a Pentair 1 HP whisperflo pump, The pool Cleaner, 2 Intellibright color changing lights and 400 sq ft. of Heliocol roof mounted solar.

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

    Re: new filter shooting DE into the pool

    There are three possibilities: there could be something wrong with the main valve that lets water through backwards, either it is set wrong or is leaking internally. One of the grids could be torn. Or it was not assembled correctly so there is a way through the filter that doesn't go through the grids. If you just had the pool built, you should tell the builder right away. Otherwise you should open up both the multiport valve and the filter and examine everything to make sure everything is put together correctly with all of the O-rings and other seals seating correctly, and that none of the grids are torn.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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