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Thread: Tiny green black spot...worry?

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    Join Date
    Sep 2010
    Location
    South Mississippi
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    Tiny green black spot...worry?

    Ok...pools been looking good but seems to have lost a bit of that sparklypoolitus it once had. Can't quite put my finger on it .... But recently noticed a few tiny blackish green spots in the beach area(pebble area) rubbed & came off. Algae? Not sure if pool is quite as "bright" as was a few weeks ago. Could I have algae starting? Here's numbers as of yesterday. I know PH needs lowering-added acid immediately. Have never shocked-should I, for good measure?

    Ph 8.0 (always high as I don't stay on top constantly-ugghh)
    FC 4
    CC 0
    TA 70
    CH 250
    Cya 20 (added more stable)
    Salt 3300
    Temp 84
    20,000 Freeform IG Gunite,Gray Plaster,Tanning Ledge w 2 Bubblers, 8f tRaised Spa with 8 jets,Fiber Optic-3 ft Sheer Decent, 1 ft Sheer Decent, Intellibrites, 2 HP Jandy Stealth Pump, 1 HP Jandy pump, 340 Jandy Cartridge Filter, Jandy Aquapure Salt System, 2-1HP Blowers....and promised but not yet delivered Rheem 105 BTU Heat Pump/Chiller

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    linen's Avatar
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    Jul 2010
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    Twin Cities, MN
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    8,649

    Re: Tiny green black spot...worry?

    When I am unsure of my water I do an Overnight Chlorine loss test (OCLT). See: http://www.troublefreepool.com/pool-...rnight_fc_test Don't forget to turn off the swg while doing the test.
    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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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Tiny green black spot...worry?

    I would STRONGLY encourage you to get your pH below 8.0 and keep it there. Not doing so may bring you some unpleasantness sooner or later.

    How much more stabilizer did you add? What was your target?

    There is almost no question in my mind you should shock your pool....if it's green/black and rubs off with your hand, there is about a 98% chance you have algae.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Butterfly's Avatar
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    May 2007
    Location
    South Carolina
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    Re: Tiny green black spot...worry?

    Are you brushing your pool? What type brush are you using? How old is your pool?

    Use a Nylon brush for vinyl, fiberglass, tile, and plaster that is less than one year. (Plaster includes any exposed aggregate and marcite finish, btw!) Combo brushes are for older plaster. All stainless are for algae (very stubborn green algae and also the ONLY brush for black algae.)

    You CAN unscrew the Wall Whale from the nylon brush it comes with and screw it on a combo brush if your plaster is over a year old. Newer plaster is really too soft for anything other than a nylon brush.
    TFP Moderator TF100 Test Kit TF100 TestKit YouTube Channel PoolMath
    You're done SLAMing when:
    1)You lose 1ppm or less FC overnight, & 2)You have .5ppm CC's or less, & 3)your water is clear.

    ~ One should not use a sledge hammer to swat a mosquito. ~

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    Join Date
    Sep 2010
    Location
    South Mississippi
    Posts
    27

    Re: Tiny green black spot...worry?

    Added 20 oz stable....worried bout adding too much too soon as Im scared I'll over do it- target is 50.(that good?)
    Pool is 1 1/2 yrs old. Regret to say ive not stayed on top of PH- add acid bout once a week & it's usually above 7.8 so I vow to do better! Will do OCLT tonight to see results. I have noticed some whitish spots in plaster- is that scale due to high PH? Haven't been brushing pool- how often should that be done once pool is back to normal? Thanks so much for all help! Guess pools are like kids...a little neglect early on has BAD consequences later on! (btw kids great!-Ha)
    20,000 Freeform IG Gunite,Gray Plaster,Tanning Ledge w 2 Bubblers, 8f tRaised Spa with 8 jets,Fiber Optic-3 ft Sheer Decent, 1 ft Sheer Decent, Intellibrites, 2 HP Jandy Stealth Pump, 1 HP Jandy pump, 340 Jandy Cartridge Filter, Jandy Aquapure Salt System, 2-1HP Blowers....and promised but not yet delivered Rheem 105 BTU Heat Pump/Chiller

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