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Thread: Black stains in vinyl pool

  1. Back To Top    #1

    Join Date
    Jun 2016
    Location
    Coralville IA
    Posts
    3

    Black stains in vinyl pool

    I have several black stains in the deep end of my pool. They are smudge/blotchy like in appearance. They range from a grayish to almost black. They were new this spring.
    I have tried brushing with a nylon brush and also with a sponge with a scratchy surface on one side. Neither of these work.

    The chemistry is good.

    Any ideas would be helpful
    Vinyl pool liner
    10,000 gal
    Pentair chlorine generator (saline pool)
    Hayward DE fillter
    Hayward natural gas heater.

  2. Back To Top    #2
    Mod Squad pooldv's Avatar
    Join Date
    Aug 2012
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    DFW, TX
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    23,999

    Re: Black stains in vinyl pool

    Welcome to TFP!

    Most likely they are organic stains. You can rub a trichlor puck on one to see if it lightens the stain. If it does then elevate FC up toward shock level for your CYA, FC/CYA Chart, and brush daily. It should go away in a week or two.
    TFP Moderator
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  3. Back To Top    #3

    Join Date
    Jun 2016
    Location
    Coralville IA
    Posts
    3

    Re: Black stains in vinyl pool

    OK
    Will give that a try.
    thanks.. will let you know the results
    Vinyl pool liner
    10,000 gal
    Pentair chlorine generator (saline pool)
    Hayward DE fillter
    Hayward natural gas heater.

  4. Back To Top    #4

    Join Date
    Jun 2016
    Location
    Coralville IA
    Posts
    3

    Re: Black stains in vinyl pool

    I placed a trichlor puck on the stain and it removed it. I have moved the puck over the other stains and they have disappeared. I left the puck on the stain area for half an hour or so. I also elevated the FC to close to shock levels to help.
    Thanks I believe this is the solution.
    Vinyl pool liner
    10,000 gal
    Pentair chlorine generator (saline pool)
    Hayward DE fillter
    Hayward natural gas heater.

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