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Thread: Big Dent in bottom of pool

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    homeschoolmoxy's Avatar
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    Big Dent in bottom of pool

    Tonight I noticed a big dent in the bottom of our pool about 4-5 inch diameter and about 4 inches deep about 1 1/2 feet away from the side wall. We have no idea what could have caused that. It looks like a cannon ball was dropped in it.
    Our pool is just over a year old and we're worried that this could cause the liner to rip or tear. I'll call the pool guys tomorrow, but it will probably be a few day before they can come and since it's been a couple weeks over the 1 year mark this is probably not covered under warranty.
    Any thoughts what to do?
    27 foot AG vinyl pool (17100 gallon) - Sand Dollar Filter 1.5 hp 2 speed pump
    TFTestkit

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    Mod Squad JohnT's Avatar
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    Re: Big Dent in bottom of pool

    It could be the result of a small leak there.
    TFP Moderator
    20K Gallon 20X36 Vinyl Inground
    Hayward S244T Sand Filter with 1HP Whisperflo Pump. Liquidator C-201 and Solar Heat

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    Mod Squad woodyp's Avatar
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    Re: Big Dent in bottom of pool

    Could alo be result of water washing down that side of pool, i.e. bad drainage there. Or draining right to the pool there. I have a divot on one edge of mine I KNOW was caused by a flash flood right after the pool was installed.
    16x32x52" Steel Cornelius Miramar AGP Vinyl liner 13,100 gal. Buried 2 ft.
    2 Speed Hayward Power-Flo Matrix 85 g.p.m. 22" 250lb. sand filter hard plumbed
    Pool Rover Jr., Pool Blaster Max, Diver Dave TF100 Test Kit/Speed Stir
    Margaritaville Frozen Concoction Maker, Liqour Chiller, & Drink Mixer & Party Tub----Collect 'um all!

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    homeschoolmoxy's Avatar
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    Re: Big Dent in bottom of pool

    Could it be a mole or some other kind of animal that dug a tunnel there?
    Should I worry about it? Will it get worse? It definitely was not there yesterday.
    How would we fix that without draining the pool?
    27 foot AG vinyl pool (17100 gallon) - Sand Dollar Filter 1.5 hp 2 speed pump
    TFTestkit

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    poolgranny's Avatar
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    Re: Big Dent in bottom of pool

    Good luck hope you can get it figured out.
    Above Ground Pool 15' by 30' Older pool -- Make ? Model ? Cost - Free; Given to Us
    Gallons approximately 11,000 (if I figured correctly)
    New liner in 2007 when pool was moved and installed by son-in-law and family members
    Hayward Sand Filter 150 pounds of sand (purchased new in 2007)
    White River 2 horsepower pump (purchased new in 2012)
    Deck built in 2011
    Bioguard 1200V Multi-Test Kit with an additional Orthotolidine Chlorine Test Kit

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    Big Dent in bottom of pool

    Hi I have extremely limited experience and do not want to dismiss what could be worth much concern. But I thought I would share that my in-laws had an AGP for 35 years, well past its life expectancy. Last summer was the first summer without it, as a matter of fact. But that thing had a sink hole very much like you've described, only bigger, for at least the 20 years I had swum in it. It was unexplained, but had no ill-effects on the function of the pool. I hope that eases your mind a little as you work to solve the mystery


    Southeastern Indiana, USA
    27' x 4' 17,600gal AG round
    1.5 HP 1 speed pump
    22" Ecco sand filter
    Jess :) from southeastern Indiana, USA
    27' x 54" ~17,600gal AG round
    Waterway Ecco 22", 250# oval sand filter 2.6 SF, 55 GPM
    1.5 hp 1-speed pump
    pool DOB July 2012

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    homeschoolmoxy's Avatar
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    Re: Big Dent in bottom of pool

    Service department in not open until Monday
    Today I noticed another smaller dip about 1 foot over from the big one. Thinking more and more that it must be from an animal
    27 foot AG vinyl pool (17100 gallon) - Sand Dollar Filter 1.5 hp 2 speed pump
    TFTestkit

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    Re: Big Dent in bottom of pool

    I have what I think are mole trails under my liner. I first noticed them 5 years ago. There are a lot of trails, but I have not noticed any liner damage.
    24ft AGP 52in deep ~13,500 gal
    Hayward Sand Filter 250 lbs
    SWG
    1.5 HP pump

    425 gal stand alone QCA Hot Tub 15-20 yrs old

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    Re: Big Dent in bottom of pool

    Anything to update from OP?


    Jess :) from southeastern Indiana, USA
    27' x 54" ~17,600gal AG round
    Waterway Ecco 22", 250# oval sand filter 2.6 SF, 55 GPM
    1.5 hp 1-speed pump
    pool DOB July 2012

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    homeschoolmoxy's Avatar
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    Re: Big Dent in bottom of pool

    Well, not really. I called the pool place twice and they told me that they would call me back, but that they are very busy
    I noticed another big dent on the opposite side of the pool close to the edge, too
    We looked around the outside edge of the pool, but could not see anything suspicious at all.
    27 foot AG vinyl pool (17100 gallon) - Sand Dollar Filter 1.5 hp 2 speed pump
    TFTestkit

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    Re: Big Dent in bottom of pool

    I have found the same sink hole over the weekend. I am waiting for a return call from the pool builders, so hopefully hear something soon!
    8000 Gallon 18' Round 52" Deep Morada Pool (Namco) DE Filter

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    cramar's Avatar
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    Re: Big Dent in bottom of pool

    Is the water level holding?
    20' X 54" Sharkline Matrix Resin AGP, 9400 Gallons, Sta-Rite 1 HP Dynamo Pump, 150 lb Pentair Sand Filter, Gorilla Pad,
    Foam Cove, Taylor K-2006 kit, BBB method, 8'X20' Fafco Sunsaver Hard Plumb, DIY Fountain, Margarittaville Fiji


    My Build: one-man-one-pool-and-one-deck-agp-pics-t37172.html
    My Build 'To-Do' List for other DIY'ers: my-pool-build-list-t40249.html?hilit=list

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    Re: Big Dent in bottom of pool

    Water seems to be holding.
    8000 Gallon 18' Round 52" Deep Morada Pool (Namco) DE Filter

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    Re: Big Dent in bottom of pool

    I have the same type problems. Pulled liner this spring, releveled ground, problem fixed right? Wrong. My ground has leveling issues, probably caused by rain and or the fact that we brought in 20 truck loads of dirt to build up our sloped yard. We packed it tight 2 years ago when we built but it seems to be still settling.

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    Re: Big Dent in bottom of pool

    We had pros do the install. No major build up and sand is under the liner. Not sure how or why, but hopefully get these pool guys out here in the next day or two.
    8000 Gallon 18' Round 52" Deep Morada Pool (Namco) DE Filter

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