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Thread: Dark specks in one corner of pool

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    GreatCanadian's Avatar
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    Dark specks in one corner of pool

    Could these possibly be algae? My numbers are:
    FC=5
    CC=0
    TA=70
    pH =7.5
    CYA=50

    FC has never fallen below 3. These specks are confined to one corner of the pool. They are black or a very dark brown and very difficult to pick off with a fingernail. They do not feel the least bit slimy at all. Could it be algae? I cannot guard my pool any closer than what I have been. How could algae have possibly formed, if it is indeed algae.

    Edit to add: Cannot be brushed off with the bristles on a Catfish pool vac.

    GC
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    linen's Avatar
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    Re: Dark specks in one corner of pool

    It doesn't sound like algae to me. If it was black algae, my understanding is your can scrap the "head" off and they are usually green on the inside.

    Could you post a pic?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    GreatCanadian's Avatar
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    Re: Dark specks in one corner of pool

    Yes, if the weather gets a bit nicer later today I will get in and take an underwater shot. The specks are so small I doubt they'd show in a pic unless I am right on top of them.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    GreatCanadian's Avatar
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    Re: Dark specks in one corner of pool

    Finally got a chance to get in the pool today and snap a few pics. I also tried to brush them off again with a stiff bristle brush. Just a few spots came off. The rest could not be brushed off:







    Any thoughts? These specks appear nowhere else in the pool, only this corner.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    Re: Dark specks in one corner of pool

    I have something similar, just went to shock level. Hope someone can give a definite answer.

    Steve
    16,000 gallon, inground. Diamond bright finish. Hayward 1.5 hp superpump, quad 80 DE filter, Jandy legacy gas heater

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    GreatCanadian's Avatar
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    Re: Dark specks in one corner of pool

    Can you brush yours off? Or scrape them off easily with your fingernail?
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    Re: Dark specks in one corner of pool

    GreatCanadian, Absolutely not. I'll let you know if the shock gets it off.

    Steve
    16,000 gallon, inground. Diamond bright finish. Hayward 1.5 hp superpump, quad 80 DE filter, Jandy legacy gas heater

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    GreatCanadian's Avatar
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    Re: Dark specks in one corner of pool

    Thanks. I would appreciate you letting me know. Tested water again just a few minutes ago. All levels are good.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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    GreatCanadian's Avatar
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    Re: Dark specks in one corner of pool

    Bump.
    The specks are still there but have not increased or decreased. It must not be algae.
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

  10. Back To Top    #10
    linen's Avatar
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    Re: Dark specks in one corner of pool

    Hmmm....I wonder what they are? Could it be hardened tree sap?
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

  11. Back To Top    #11
    GreatCanadian's Avatar
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    Re: Dark specks in one corner of pool

    Holy ****!! Brilliant!! Built a new deck. And that corner is where the ladder is. I drilled holes there to nest the ladder in. Some wood chips or sap must have made its way into the pool. I bet you are correct sir!!
    13'x22'x52" 8,000 gallon ProSeries Pool with Borates
    Intex 110 pound Sand Filter with Zeobrite, 2650 gph pump, 0.95 hp
    Bestway SWG
    AquaPro ECO500 50,000 BTU heat pump
    GLI Whirlwind Solar Cover Reel, TF-100 Test Kit

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