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

Thread: WHERE IS THE WATER GOING? Pool leaking only when filter is off

  1. Back To Top    #1

    Join Date
    Apr 2015
    Location
    Hull, GA
    Posts
    56

    WHERE IS THE WATER GOING? Pool leaking only when filter is off

    Hello, I have seen this issue addressed in other posts but not exactly like my situation. I have a vinyl lined inground pool, with a Hayward sand filter. I will lose about 3 inches overnight if we turn the filter off. If we leave the filter on all day and all night we don't lose anything. 3 inches of water is a lot and we cannot figure out where it is leaking from, and where is this water going? Any advice on how to diagnose the leak? Thanks so much
    Inground, vinyl pool.Hayward Sand filter. 24,200 gallons.

  2. Back To Top    #2

    RonsPlc's Avatar
    Join Date
    May 2015
    Location
    Gaylesville, AL
    Posts
    360

    Re: WHERE IS THE WATER GOING? Pool leaking only when filter is off

    when you are running your pump, is air coming out of the return(s)?

    Is suspect that you have a suction side leak.
    14600 gal Intex 24' Round 52" deep AG Pool (Heavily Modified)
    200lb sand filter w/2 speed 1.5/0.5hp pump
    Stenner 45MHP10 Liquid Chlorine (well... bleach) Injector. Borates added.
    K-2006 test kit w/Speedstir
    Pool School - PoolMath - HIGHLY Recommended Test Kits

  3. Back To Top    #3

    Join Date
    Apr 2015
    Location
    Hull, GA
    Posts
    56

    Re: WHERE IS THE WATER GOING? Pool leaking only when filter is off

    There are no air bubbles coming out of the returns. Also, no telltale water spots on the lawn or around the deck that would indicate where this water is going. Or coming from.

  4. Back To Top    #4
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: WHERE IS THE WATER GOING? Pool leaking only when filter is off

    Agreed, it is likely a leak on the suction side underground. Elbows under skimmers are the culprit sometimes.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  5. Back To Top    #5

    Join Date
    Apr 2015
    Location
    Hull, GA
    Posts
    56

    Re: WHERE IS THE WATER GOING? Pool leaking only when filter is off

    This may be a silly question ... But does that mean I hire a pool guy to come take a look at it? Is there anything a homeowner can do to try and figure out where the leak is if it's underground?

  6. Back To Top    #6
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: WHERE IS THE WATER GOING? Pool leaking only when filter is off

    Leak detection companies have special equipment that tracks down leaks.

    Here are a couple of articles from Pool School on leaks
    Pool School - Leak Detection
    Pool School - Suction Side Air Leaks
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  7. Back To Top    #7

    Join Date
    Aug 2014
    Location
    Northern IL
    Posts
    4,615

    Re: WHERE IS THE WATER GOING? Pool leaking only when filter is off

    I hope you don't mind me side-tracking this a bit, but I don't understand how the pool DOESN'T leak with the filter on, but does when it's off. When the filter is off, is the pump off too?

  8. Back To Top    #8
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
    Location
    DFW, TX
    Posts
    23,994

    Re: WHERE IS THE WATER GOING? Pool leaking only when filter is off

    Sometimes the ground water and dirt will sort of plug the hole when the pump is running and let it trickle out when the pump is off. I saw one suction leak that wouldn't leak for the first 30-60 min because it would suck all the leaked water back in and once it was gone it would start sucking air. Suction leaks can be weird and hard to find.
    TFP Moderator
    If TFP helped you or saved you money - Become a TFP Supporter! <--Click here
    2012 build and pics, 20k gal gunite, black onyx pebblesheen, OK flagstone, IntellifoVS, cart filter w/Pleatco, IC40 SWG, Solartouch, 5 12'x4' solar panels, HP50HA heat pump, 8mil solar cover, borates, TF-100 test kit, SONOS, Doheny's Discovery Robot, hot tub on bleach

  9. Back To Top    #9

    Join Date
    Apr 2015
    Location
    Hull, GA
    Posts
    56

    Re: WHERE IS THE WATER GOING? Pool leaking only when filter is off

    Thanks for the advice everyone. 😊

    - - - Updated - - -

    Yep, we were wondering that as well. And, WHERE is all the water going? Ugh.

Posting Permissions

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