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Thread: FNS Plus filter disassembly/assembly - help!

  1. Back To Top    #1

    Join Date
    Jun 2015
    Location
    Dallas, TX
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    148

    FNS Plus filter disassembly/assembly - help!

    I just took apart my Pentair FNS Plus 48 to replace an o-ring and put in new grids. In doing so, I noticed something odd - it looks like the entire grid assembly is suspended in the air above the bottom floor of the filter case by the assembly's connection to the standpipe (at the assembly's manifold).

    Is this normal? It almost looks like there should be some sort of support bracket between the floor of the filter case and the bottom of the filter assembly spiderweb. In other words, the filter assembly is too short to connect to both the standpipe at the assembly's top and also make contact with the floor of the filter case.

    Any thoughts? This is my first time disassembling/assembling the filter and I'm worried that the previous owner may have broken a part and not replaced it. Thanks for any help!
    9,000 gallon IG pool with spa, Pentair FNS Plus 48 DE filter, 2HP Whisperflo pump, 0.75HP Letro booster pump, Polaris 280 cleaner, EasyTouch controller (originally a Compool LX100 that was upgraded via Pentair's upgrade kit), TF-100 kit

  2. Back To Top    #2
    Texas Splash's Avatar
    Join Date
    Jun 2014
    Location
    South-Central Texas, Marion/San Antonio
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    12,982

    Re: FNS Plus filter disassembly/assembly - help!

    Maybe something on this video will look familiar or confirm any of your suspicions? Cleaning a Pentair FNS Plus Filter Troubleshooting - YouTube
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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