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Thread: FNS36 filter - just blew the top off... help

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    FNS36 filter - just blew the top off... help

    New house, filthy pool, FNS36...

    Replaced the grids but because the pool was so dirty pressure went up to 30 almost immediately so I backwashed, and kept going.

    Overnight, pool level dropped, pressure on FNS36 dropped to 0. So I filled the pool back up and turned the filter back on.

    The filter's middle has separated, even with the band on tight. Water's leaking out... turned off the filter and posting here.

    I'm going to go take the top off and survey the damage.

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    Re: FNS36 filter - just blew the top off... help

    Actually a little worried about taking that metal band off seeing as how the top has separated a bit already it's probably under some extraordinary pressure - any suggestions?

    Thanks!

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    Mod Squad jblizzle's Avatar
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    Re: FNS36 filter - just blew the top off... help

    There is no pressure in the filter when the pump is off ... your gauge should show you that as well.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
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    Re: FNS36 filter - just blew the top off... help

    It's not the filter pressure I'm worried about (it's 0), it's the pressure on the filter band ratcheted closed, and whether because the top a dislodged a bit could cause that band to whip back when it gets ratcheted open.

    It was miserable to put on - it was already incredibly tight... so now I can see that spring becoming a missile

    http://www.poolpartsonline.com/p-11527- ... embly.aspx

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    Mod Squad jblizzle's Avatar
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    Re: FNS36 filter - just blew the top off... help

    It should loosen up the spring completely before the nut disengages.

    These are the type of bands similar to my filter. I HIGHLY recommend that you you use a rubber mallet to tap around the band to help seat it and not just try to use torque on the nut. I can get mine very tighter with very little torque by gently tightening the nut, then tapping around the band, then tighten, then tap, etc ... I can get the spring fully compressed with very little force. And if tapping does not loosen the spring, then I know I am fully seated.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    Re: FNS36 filter - just blew the top off... help

    just took the top off.... nothing terrible happened... just wondering if I'll be able to put R2D2 back together again after that (or is it humpty dumpty)..

    And thanks for the tapping tips - that makes a lot of sense.


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    Re: FNS36 filter - just blew the top off... help

    Postscript... no damage... got the top back on, tapping the band with a mallet, backwashed, refilled w/DE, and it's humming along.

    Cool.

    Thanks jblizzle

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    Re: FNS36 filter - just blew the top off... help

    'Glad to hear your good news!
    SW Las Vegas, Nevada 10,294 Gal pool, 660 Gal attached spa - 10,949 Gal total. Plaster. 550 Series Hayward Cartridge filter w/ 550SqFt surface area. Flow rate 150GPH, 2.5 Hp single speed pump. Built 2005 with attached spa that sits higher than pool but is on same filtration system.
    I use TFTestkits , Pool Calculator , Pool School - Easy Peasy to do - and am VERY happy with my pool!

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