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Thread: FNS Filter use with Salt Water Pool

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    FNS Filter use with Salt Water Pool

    Hello, my FNS Plus DE filter was leaking a bit at the bottom drain this morning so while I was tightening the plug I noticed the label states "Suitable for Fresh Water Use Only"

    Has anyone experienced issues with using this model with a Salt Water pool ?
    In Ground Plaster Pool
    20000 Gallons
    Ecomatic SWCG
    1 HP WhisperFlow Pump
    Pentair FNS Plus 48 DE Filter

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    Mod Squad JohnT's Avatar
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    Apr 2007
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    Re: FNS Filter use with Salt Water Pool

    I expect they just don't want you using it for sea water at 35,000 ppm. 3500ppm salinity pool water is fresh water compared to that.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Join Date
    May 2007
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    Re: FNS Filter use with Salt Water Pool

    That is exactly correct.

    Scott
    PoolGuyNJ
    Owner of - PoolGuyNJ LLC
    Expert Pool and Spa Repairs, Renovations, and Augmentation. Helping people decide what is the right gear for meeting their needs. Expectations Set, Expectations Met, No Surprises.

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