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Thread: Black scum ring in skimmer

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    Mid-West Infidel's Avatar
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    Jun 2015
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    South KC, Missouri
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    Black scum ring in skimmer

    First of all a brief history-

    We've had the pool for about 8 years now. Seems like every year I have some kind of algae issue. I think part of my problem is all the trees around me... I only get full sun from about 10am to 3:30 pm. I found TFP late last year and after some thought, decided to try the liquid chlorine method this year. Actually, want to use up my remaining 3 in 1 tabs, while monitoring CYA. I figure when it starts creeping up, I'll make the switch.
    I just installed a new liner, filled pool and water is nearly balanced (see below). Like last year, I am already starting to see a black scum ring developing in the skimmer box. No one has been in the water yet, so I don't think lotions, etc. are a concern.
    I installed new sand in my filter last year, by the way.
    Can anyone tell me why this is happening and how to correct it?
    TA-60
    CH-110
    pH-7.4
    CYA-<30
    FC-12.5 We've had a bit of rain so I did add some liquid bleach (obviously too much)...
    CC-0.5
    BD-1

    You can start to see it in this pic:

    Attachment 38400
    24' round, above-ground Doughboy, Mistique 52" side-wall pool w/ bowl shaped bottom. (approx 15,200 gallons). Installed in 2007.
    #200 Sand Dollar Filter. All new sand in 2014.
    1.5 HP Dynamo pump. New impeller and shaft seal in 2015.
    New liner installed in 2015.

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    Mod Squad kimkats's Avatar
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    Re: Black scum ring in skimmer

    I have the same thing. I just scrub it with a Magic Eraser and it is good for a while. I do not know what it is but I too have trees around.

    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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    Scuba_Steve's Avatar
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    May 2015
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    Pooler, GA
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    Re: Black scum ring in skimmer

    Here you go. It is also characterized by a ring in the skimmer as you described.

    http://www.cgtpoolliners.com/tb-7
    6425g Intex Ultraframe 18'x48" AG
    Stock 1500gph cartridge filter / Intex SWG CG-28669 with E.C.O.
    Install date: 5/26/2015
    TF-100
    Helpful Links

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    Mid-West Infidel's Avatar
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    Re: Black scum ring in skimmer

    Quote Originally Posted by Scuba_Steve View Post
    Here you go. It is also characterized by a ring in the skimmer as you described.

    http://www.cgtpoolliners.com/tb-7
    Thanks for the link Scuba_Steve. The stuff ends up like tar, that's for sure!
    24' round, above-ground Doughboy, Mistique 52" side-wall pool w/ bowl shaped bottom. (approx 15,200 gallons). Installed in 2007.
    #200 Sand Dollar Filter. All new sand in 2014.
    1.5 HP Dynamo pump. New impeller and shaft seal in 2015.
    New liner installed in 2015.

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    Casey's Avatar
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    Apr 2007
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    SW PA
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    10,157

    Re: Black scum ring in skimmer

    You can buy a scum ball n throw it in the skimmer box. It'll absorb that and keep it from adhering to the skimmer.
    I'd bet you my bikini you'll never get TFP water from a pool store!

    24' Sharkline Venture De Filter

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    Mid-West Infidel's Avatar
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    South KC, Missouri
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    Re: Black scum ring in skimmer

    Quote Originally Posted by Casey View Post
    You can buy a scum ball n throw it in the skimmer box. It'll absorb that and keep it from adhering to the skimmer.
    Never heard of the scum ball, but I Googled.... Sounds like a plan.
    Thanks!!!
    24' round, above-ground Doughboy, Mistique 52" side-wall pool w/ bowl shaped bottom. (approx 15,200 gallons). Installed in 2007.
    #200 Sand Dollar Filter. All new sand in 2014.
    1.5 HP Dynamo pump. New impeller and shaft seal in 2015.
    New liner installed in 2015.

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