Become a TFP Supporter Pool Math Forum Rules Pool School
Results 1 to 9 of 9

Thread: Leak diagnosis

  1. Back To Top    #1

    Join Date
    Feb 2008
    Location
    Milford, CT
    Posts
    333

    Leak diagnosis

    My pool lost 1/4" of water in 24 hours, and since Ive suspected it was leaking, this is pretty good confirmation Im correct!

    I have 2 suction side inlets (one skimmer, one main drain) and 2 returns. I sealed off the returns and the skimmer, but obviously its almost impossible to seal off the main drain. With 3 of the 4 ports sealed off, the pool lost 1/4" of water in 24 hours.

    So its either the liner or the main drain. I do NOT get any air in the suction or return sides with the filter running, but I suppose there is a small chance the water can be trickling out of the main drain pipe with the system off, but the leak might seal itself with the system on.

    Does anyone have any suggestions on narrowing down liner vs main drain? The only way I can think of to seal the main drain is to send in a diver, but at that point I can have the diver search the liner for a leak too.

    Thanks in advance.

    -Chris
    22K IG vinyl, .5HP Northstar pump, S244T filter, AutoPilot Digital w/SC-48 cell

  2. Back To Top    #2
    guamguy's Avatar
    Join Date
    Feb 2010
    Location
    Guam, USA
    Posts
    388

    Re: Leak diagnosis

    I would try the bucket test twice, once with the pump running, and again with it off. This would narrow down if it's the liner or main drain. Do you have valves to adjust the suction between main drain or skimmer? This would let you put full suction on the main drain and see if the leak stops when the pump is running.
    12,800 gallon IG plaster kidney-shaped pool, waterslide, 800 gallon spa.
    1HP 2 speed Sta-Rite pool pump, 1.5 HP Sta-Rite spa jet pump. 2 skimmers, 1 main drain
    Purex-Triton TR-60 325 lb.sand filter. 2" Plumbing, Intex SWCG, TF-100 test kit.
    Link to pics of my pool! http://www.troublefreepool.com/my-oasis-t26558.html

  3. Back To Top    #3
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,348

    Re: Leak diagnosis

    I agree on trying the bucket test twice ¼" per day is actually less than normal around here on some days.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  4. Back To Top    #4

    Join Date
    Feb 2008
    Location
    Milford, CT
    Posts
    333

    Re: Leak diagnosis

    OK, I ran the experiment for 4 days total. 2 days with the filter off and the 2 returns and skimmer plugged. The other 2 days with everything running and unplugged.

    During the days with the filter off, I lost more water in the pool than the bucket.

    During the days with the filter ON I lost the same amount (or very close to) of water in the pool as I did the bucket

    So, does that mean the leak is the main drain? Since I couldnt seal it for the "filter off" days. I figured if the liner was leaking it would leak regardless of filter on or filter off.

    Strange thing is that I dont get any air or water loss with the filter running, so maybe its sealing itself back up once under suction from the filter ?
    22K IG vinyl, .5HP Northstar pump, S244T filter, AutoPilot Digital w/SC-48 cell

  5. Back To Top    #5
    Mod Squad zea3's Avatar
    Join Date
    Jul 2009
    Location
    Houston, Texas
    Posts
    9,202

    Re: Leak diagnosis

    If you have a waste line, make sure it is not leaking when the pump is running. 1/4" loss would probably be a slow trickle.
    TFP Moderator
    Helpful links: TF Test Kits,TFP Pool School, PoolMath
    Vogue 21' round AG, Pentair 1 hp 2 speed pump, 36 sq ft DE filter, Hayward S180T 150# sand filter, Houston, Texas
    Love TFP? Become a
    TFP Supporter!

  6. Back To Top    #6

    Join Date
    Feb 2008
    Location
    Milford, CT
    Posts
    333

    Re: Leak diagnosis

    The problem is that the leak goes away with the pump ON. Comes back with the pump OFF.
    22K IG vinyl, .5HP Northstar pump, S244T filter, AutoPilot Digital w/SC-48 cell

  7. Back To Top    #7
    Mod Squad Bama Rambler's Avatar
    Join Date
    Jun 2009
    Location
    SouthWest Alabama
    Posts
    22,348

    Re: Leak diagnosis

    If that's true then what you have is a suction side leak. It's may not leak much air in when running but it apparently is leaking water out when it's not.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

  8. Back To Top    #8

    Join Date
    Feb 2008
    Location
    Milford, CT
    Posts
    333

    Re: Leak diagnosis

    Its actually past time to close the pool. Since it looks like the main drain is leaking, Im guessing I need to pay a diver to get down there and plug it up? Otherwise I cant close the pool without losing all of the water over the winter (thereby collapsing the pool, which at this point isnt a bad idea to me!! the wife and kids dont agree though)
    22K IG vinyl, .5HP Northstar pump, S244T filter, AutoPilot Digital w/SC-48 cell

  9. Back To Top    #9

    Join Date
    Mar 2007
    Location
    Coastalish 'down easter'
    Posts
    4,160

    Re: Leak diagnosis

    Hey, I've followed this thread and you've got the worst that I suspected

    As has been said, it certainly looks like the MD line has a leak that is ameliorated when the pump is running, the suction on the line keeps the water from leaving the pool.

    I fear you'll need to plug the line for the winter to prevent major water loss

    However, with the plug in place you can pressure test the line to get an idea, not only of how large the leak is, but possibly the location

    It SUCKS to close a pool knowing there's a problem, but we can deal with it next spring. The important thing is to keep the pool viable until we can properly address the problem.
    Luv& Luk
    -Ted

    Having done construction and service for 4 pool companies in 4 states starting in 1988, what I know about pools could fill a couple of books - what I don't know could fill a couple of libraries :-D

    POOL SCHOOL, TF Testkits, Jason's Pool Calculator, CYA vs. cl chart, (Just a few DARNED handy links!)

Posting Permissions

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