Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 12 of 12

Thread: Replacing hard to reach drain plug on Pentair filter.

  1. Back To Top    #1

    Replacing hard to reach drain plug on Pentair filter.

    Hello. I have a Pentair FNS Plus 48 filter, these come with a drain plug in a cavity at the bottom



    I never used it because the piping for inlet and outlet was left to close to it and there is no room for a wrench to turn. I usually put the valve in back wash, open the top air relief valve and water drains on its own.
    Unfortunately the plug developed a big leak, water shoots out from it when the pump runs, so I need to replace it.
    I imagine if I take the whole filter apart, which I'm going to do anyway for a thorough clean, I could try to undo the drain plug from inside.
    Has anyone tried it? Any tips?

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Location
    Silver Spring, MD
    Posts
    37,879

    Re: Replacing hard to reach drain plug on Pentair filter.

    Search on Google for "Pentair FNS Plus parts" and a number of vendors that sell parts for your filter will show up in the results.
    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
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Replacing hard to reach drain plug on Pentair filter.

    Depends what the inside of the plug looks like, but I would think that may not be very easy to do.
    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!

  4. Back To Top    #4
    bobodaclown's Avatar
    Join Date
    Apr 2011
    Location
    Lakeland, FL
    Posts
    2,351

    Re: Replacing hard to reach drain plug on Pentair filter.

    You may be able to get away with an 1.5 inch plumbing plug from home depot/lowes. From the Owners Manual. 24 86202000 Plug, 1 in. drain, with O-ring http://www.pentairpool.com/pdfs/FNSPlusOM.pdf
    17K Kidney Shaped Pool Concrete (Diamond Bright) Pool, 3/4 hp 2 speed 115V Sta-rite Duraglas PEA5D-180L/P2R5D-181L (Impeller C105-92PS Diffuser C1-216P), 1.5 piping, Pentair CC100 Filter , Heat Siphon 100K BTU Heat Pump Pool Heater, Flow meter Blue White Flowmeter Model No. F-30150P, Hayward Astrolight SP0581N, SWCG CalimarTitanium Edition TE45 , Dolphin Nautilus Plus with CleverClean, Lakeland Florida

  5. Back To Top    #5

    Re: Replacing hard to reach drain plug on Pentair filter.

    Thanks for the replies, and it is not about finding the part, I have the replacement part; it is about being able to reach to unscrew the damaged one and put the new one.
    I can saw off, from the inside the old part, but screwing in properly the new one is still the challenge, since I'll face the same sitaution of not being able to use any tool, being blocked from the too close piping.
    What I'm seeing is that the inlet and outlet feeds could be unscrewed, with the filter disassembled I could lift it off and do the work on a comfortable work bench, then put it all back together. I would post the pictures to explain better, but I cannot - out of thread but how do I go about requesting an increase to a 449KB picture limit?

  6. Back To Top    #6
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Replacing hard to reach drain plug on Pentair filter.

    You either have to Become a TFP Supporter or use another photo hosting site and post them following this: How To Post Pictures
    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!

  7. Back To Top    #7
    frustratedpoolmom's Avatar
    Join Date
    May 2007
    Location
    SWSuburban Chicago, IL
    Posts
    11,965

    Re: Replacing hard to reach drain plug on Pentair filter.

    Those are a pain. I use a screw driver shaft on its side to loosen. Maybe you could find and extra long one?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
    http://www.PerfectlyClearPoolService.com

  8. Back To Top    #8
    Mod Squad jblizzle's Avatar
    Join Date
    May 2010
    Location
    Tucson, AZ
    Posts
    37,389

    Re: Replacing hard to reach drain plug on Pentair filter.

    I am glad that Hayward puts them on the opposite side from the plumbing and not way under ... that does look to be a pain
    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!

  9. Back To Top    #9
    Richard320's Avatar
    Join Date
    Jan 2010
    Location
    San Dimas, CA (LA County)
    Posts
    18,768

    Re: Replacing hard to reach drain plug on Pentair filter.

    If you take the whole filter apart to clean it, two more couplings will undo the plumbing and you ought to be able to just lift the emptied-out body out to where it's easier to work on.
    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!

  10. Back To Top    #10

    In the Industry

    Join Date
    Nov 2011
    Location
    Moberly,MO
    Posts
    978

    Re: Replacing hard to reach drain plug on Pentair filter.

    Gear wrench. Neff said
    Over 30 years in the pool business
    We build vinyl, fiberglass, stainless steel pools
    Certified in Hydraulics

  11. Back To Top    #11

    Re: Replacing hard to reach drain plug on Pentair filter.

    Quote Originally Posted by Richard320 View Post
    If you take the whole filter apart to clean it, two more couplings will undo the plumbing and you ought to be able to just lift the emptied-out body out to where it's easier to work on.
    The inside inlet pipe is positioned right above the drain plug and seems to be there to stay, glued, doesn't seem to have a thread. I'll check with Pentair, but it looks fixed...so I can see the top of the drain plug but it is blocked by the inlet pipe for pliers to work. Unscrewing the two large couplings that hold the body to the inlet and outlet piping seemed intimidating to me, but I may not have a choice.
    Gear wrench does not work, blocked by the rest of the piping, there's not even enough room for the wrench to stay level and grab the plastic nut at the bottom of the plug.

  12. Back To Top    #12

    Re: Replacing hard to reach drain plug on Pentair filter.

    Sucess! I took the advice of Richard320, uncouple the outlet and inlet couplings (I used those rubber bands for opening stubborn jars) and lifted the empty body to the work bench. The drain plug was completely broken and separated from the thread into the bottom of the filter body, I had to saw, carefully the threaded part to take it out.
    I sawed in, a millimeter into the threads of the filter body, sorry.
    Replaced the plug, they re-designed them, now it could be possible to simply use your hand.
    Anyway, re-assembled the body of the filter to the inlet/outlet piping and fired it up.
    No leaks.

    Off thread, I had to do all this in 104 degree weather in Southern California; but it feels pretty good to have solved it; thanks TFP Experts, and others!

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •