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Thread: Please help. DE at the bottom of my pool.

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    Please help. DE at the bottom of my pool.

    Hi All,
    I recently installed a Pentair FNS plus 48sqft filter and a 3/4HP Whisperflo pump. I get DE at the bottom of my pool though. I took the filter apart and inspected and cleaned the grids. All seemed OK so I weighed out 4.5lbs of DE and recharged the filter but still getting DE in the pool. It's a small amount though, it doesn't blow out of the retruns or anything like that and the pool water itself is clear. Any suggestions on how to clear this up? IS the filter on my Blue Diamond fine enough to trap the DE? I put it in and it picks it up abut then it returns later. I'm thinking the Diamond may stir it up but not actually trap the DE.

    Thanks!
    Joe
    15,500 gal, inground gunite pool with 7 ft spa, 2 speed pump 2hp/.33hp, 3/4 hp booster pump, Intermatic P1353 timer, AutoPilot SC-48, Sand filter with ZeoBest, Heater, that I never use . . .

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    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,887
    The Blue Diamond should be able to trap the DE. You should be able to see some of it in the collection bag.

    DE in the pool usually means a problem with the grids, either holes, or installed improperly. Did you remember to use the rinse setting after backwashing (assuming your valve has a rinse setting)?
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  3. Back To Top    #3
    I did use the rinse after backwashing and the grids looked fine ot me. It's a brand new filter. Maybe I should call Pentair......
    15,500 gal, inground gunite pool with 7 ft spa, 2 speed pump 2hp/.33hp, 3/4 hp booster pump, Intermatic P1353 timer, AutoPilot SC-48, Sand filter with ZeoBest, Heater, that I never use . . .

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