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Thread: Liner corners stretching - is this normal?

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    Join Date
    Jul 2015
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    NJ
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    Liner corners stretching - is this normal?

    Hello everyone new pool owner here. We have an inground vinyl liner pool that was installed about two months ago. Already I am seeing the corners where the wall meets the floor start to pull back and curve a little bit. It feels hollow behind them, like there maybe air back there. The corner has pulled away maybe 2" from being 'square'. Think more like a C than an L shaped corner.

    Can somebody please let me know if this is normal (as my pool installer of course said). We have a pretty high water table but we had drains everywhere so I'm hoping this isn't the beginning of a floating liner. Please let me know if this is normal or if I should push back on my installer.


    L-shaped IG vinyl 36,000g Hayward DE Filter 2HP SWG

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    Swampwoman's Avatar
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    Apr 2012
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    Grand Rapids, MI
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    Re: Liner corners stretching - is this normal?

    Welcome, Jim, and congrats on your new pool. I didn't originally build the pool I own but I do read up now and then about vinyl liners because mine is 15 years old

    First off, I have noticed this in many pools, including my own in some corners. Secondly, I have read that it is a symptom of a tendency on the part of pool builders to install liners that are just slightly smaller than measured in order to have a nice snug fit without wrinkles, wherein the liner is stretched slightly to fit.

    I don't have any way of helping you determine just how much stretching is too much stretching, but will note that my liner, as I mentioned, is 15 years old and has never torn or leaked and has a robot romping around daily to clean it So its quite likely that you don't have to worry about it, with an even higher probability that it is completely unrelated to water table issues...with water infiltration, you would instead find squishy bubbled areas that then turn into wrinkles when the water table recedes -- and that would be floor and walls as opposed to corners.

    To keep vinyl liners nice, you want to keep your ph in range, and to stay within "safe" guidelines if ever you need to "shock" or slam ("shock level and maintain" -- a TFP phrase representing the most effective way to eliminate algae issues.)

    To maintain these safe ranges, I highly recommend either of the two test kits, TFT100 or specifically the Taylor K 2006, because both can test higher FC when slamming and both can test CYA, and both will give you the most accurate ph levels, etc. as they are drop kit tests. Here's a link: TFTestkits.net

    The easiest way to have a "trouble free pool" is to use the maintenance method advocated here, so have a read about the approach...the method is based on maintaining the correct ratio of cya:chlorine, and I've not HAD to shock in the four seasons since discovering this site while recovering my foreclosure pool

    Please let us know if you ave questions or require guidance on your water chemistry and routine, and enjoy your new pool!
    In ground extended Grecian, 22,000 gal, Hayward 220t sand filter, vinyl liner, dolphin m4 supreme.
    If TFP has helped you, please click to SUPPORT TFP!
    Helpful Links:
    GET A TEST KIT Chlorine/CYA Chart How to SLAM About Metals & Stains

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    Join Date
    Jul 2015
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    NJ
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    Re: Liner corners stretching - is this normal?

    Great reply and makes me a little more comfortable. Just received my test kit the other day. Spending hours every night it seems reading about the Chems. Been very hot here the last week in NJ so struggling to keep up with the chlorine. I think I need to raise my CYA as well as its only around 40. Seems like I should be around 60-80.


    L-shaped IG vinyl 36,000g Hayward DE Filter 2HP SWG

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    NJ
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    Re: Liner corners stretching - is this normal?

    Thanks very much for your help!


    L-shaped IG vinyl 36,000g Hayward DE Filter 2HP SWG

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    Mod Squad kimkats's Avatar
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    Jul 2012
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    Tallahassee, FL
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    Re: Liner corners stretching - is this normal?

    If your SWG is working than yes you do need to raise your CYA. Here is a link for that.

    Pool School - Chlorine / CYA Chart

    Note there are two charts-one for non-swg and one for swg.

    I hope this helps!

    Kim
    TFP Moderator 33x52 round AG 25,600 gals Sand Filter 1.5hp Pump - 2 Speed, SLAM, Pool School, Recommended Levels, Recommended Chemicals, Pool Math, Chlorine/CYA Chart, TF-100 Test Kit

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