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Thread: Worm stains on bottom of vinyl liner

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    Worm stains on bottom of vinyl liner

    After opening the pool a few weeks ago, there are dark stains in various spots on the bottom of our vinyl liner. Some are long and others are wider and short, mostly in the shallow part, but one spot in the deep end. The pool opening people say they are worm spots. He said when they opened it, the found dead worms in various spots on the bottom. They have increased the chlorine levels in the pool. The spots seem a least bit lighter, but not much. What can be done with these spots? When the pool people put some granular chlorine on some spots, it seemed to lessen them a little. Is there anything else that can be done? It has been two days since the chlorine has been increased. Will these spots go away? Is there anything else we can try?

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    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Worm stains on bottom of vinyl liner

    Those are organic stains, which fade over time, faster with higher FC levels. Keep the FC level a little higher than normal for several days to a week and they should fade away.
    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

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    Re: Worm stains on bottom of vinyl liner

    Last year I had some stains in the deep end that had been there for a couple of years. I think they were rust stains from something that stayed in the pool over winter. I read somewhere (maybe here) about vitamin C tablets. So I tried it and it worked...

    Here is what I did.
    1) bought some cheap chewable vitamin C tablets
    2) crushed about 10 or so and put them in a nylon sock
    3) added some rocks in the sock as well to help weigh it down
    4) drop the sock on the stain (had to use the broom to position it directly over the stain)
    5) The next morning, the stain was smaller so I repeated this a few days and the stain went away.

    Hope this helps!
    23,000 gallon in ground L Shaped Vinyl Pool, Barracuda vacumn, sand filter. Located in Virginia. Member since July 2010.

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