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Thread: Leak in Pentair FNS Plus DE filter. Any advice?

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    Leak in Pentair FNS Plus DE filter. Any advice?

    Hi All,
    My 5 year old Pentair filter has started to leak between the top lid and bottom base. I tried tightening the clamp but no luck. Any ideas on a fix or do I just need to replace the gigantic O-ring?
    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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    Richard320's Avatar
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    Jan 2010
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    Re: Leak in Pentair FNS Plus DE filter. Any advice?

    I guess the big question is: has anyone disturbed the giant O-ring lately?

    If not, I personally would worry. Could be high, high pressure or even a crack. In my experience as a mechanic, I've found O-rings don't leak unless they've been taken apart and reused.

    But no matter what, you're gonna have to pull it apart to see, so I'd get a new O-ring standing by and some silicon lube for it, both available at the dreaded Pol Store. Long as it's apart, scrub the screens.
    16K freeform gunite with spa; Pentair 4000 DE filter; Century Whisperflow 1 HP; Pentair Minimax heater.
    Troublefree does not mean Maintenancefree. It's like brushing your teeth: You can spend a couple minutes a day and pennies a week or go to the dentist once a year and spend several thousand dollars.
    A pool is like a pet - you have to feed it every day, even the days you don't want to play with it!

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    Re: Leak in Pentair FNS Plus DE filter. Any advice?

    I took it apart earlier in the season to clean the grids. Pressure is normal (<15psi). It was sealing tight for a few months but just started leaking.
    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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