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Thread: Mustard Algae

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    boston62's Avatar
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    Mustard Algae

    I am a new in ground pool owner, I am having this one little problem algae around one main drain, looks like a light brown stain then a few brown spots about maybe 6 in all, nothing in the spa which has a spill over into the pool...

    1: I have shocked it with liquid chlorine, got the FC up to 30 ppm, but it didn't touch the algae...

    Right now the pool is at:

    FC = 25 ppm
    PH = 8.2
    TA = 75
    CYA = 100
    CH = 375

    right now I have turned off my SWG to allow the FC to drop....

    Thanks for the help..


    Pool = 13,000
    SWG
    Filter = Cartridge 150
    Pump = single speed

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    Patrick_B's Avatar
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    Re: Mustard Algae

    Welcome to TFP

    You have likely not had your FC high enough for long enough with the CYA level at 100. Shocking is a process done over time, not a one time event. It's difficult to kill algae with your stabilizer that high especially Mustard Algae if that is indeed what you have.

    I suggest a drain and refill of at least 40% in attempt to get the CYA down to 60 for a start. You may be higher than 100 CYA. But I would start there.

    Dig into Pool School. ABC's, Defeating Algae, and how to SLAM your pool. You will need a high range FC test to do this, such as the one that comes in the TF100.
    TFP Moderator
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    28K Gal IG FreeForm, CLI Quartz, Pentair 36"SF & VS Pump, Dolphin M5, Rheem

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    Butterfly's Avatar
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    Re: Mustard Algae

    Welcome to TFP

    The problem with 100 CYA test result is that tests report 100 CYA or anything above 100 also as 100 Some folks have found their CYA waaaaaayyyy higher than tested. Doing a CYA dilution test would give a better idea of true CYA level.


    I suggest a drain and refill of at least 40% in attempt to get the CYA down to 60 for a start. You may be higher than 100 CYA. But I would start there.
    ^^ Me, too.
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    You're done SLAMing when:
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    frustratedpoolmom's Avatar
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    Re: Mustard Algae

    Do the spots brush away?
    Helpful links: Pool School; CYA/Chlorine Chart
    24' round AG pool, 52" high, Raypak heater; Waterway 2 spd Pump;
    150 Sq ft. Clearwater Cartridge Filter; Former and DISSATISFIED "Pool Frog" owner
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    Re: Mustard Algae

    If it looks like a stain and chlorine isn't affecting it how do you know it's algae? Have you ever used algaecide before, or any type of mineral system?
    JD - 28' Round Above Ground Pool, 17,000 Gallons. Dual speed Jacuzzi pump with cartridge filter. Dual speed 1 HP pump, Hayward S210T sand filter
    Pool School - PoolMath - HIGHLY Recommended Test Kits

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    boston62's Avatar
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    Re: Mustard Algae

    Quote Originally Posted by Donldson View Post
    If it looks like a stain and chlorine isn't affecting it how do you know it's algae? Have you ever used algaecide before, or any type of mineral system?
    I did add an algacide before, after I saw the brown stain..they sure look like round algae spots, they do not brush away...

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    boston62's Avatar
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    Re: Mustard Algae

    I have the Taylor 2006 test kit, I added a stabilizer when my CYA was low around 50, then it shot up over 100....it is now dropping, I was told it takes a week or so for the CYA to come down after using stabilizer. Thanks to everyone applying...

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    boston62's Avatar
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    Re: Mustard Algae

    These are my test numbers

    FC 7
    CC 0
    PH 7.6
    TA 75
    CH 350
    CYA 70

    I think I am getting black algae, I only have 4 small round spots. Do I need to SLAM?

    I put a puck on it to see if it removes it.

    Thanks

    13,000 Gal Pool & Spa
    Jandy Automation /w IAqualink
    Autopilot SWG
    Jandy 2.0 HP VSP, Filter Cartridge
    Taylor (FAS-DPD K-2600, Pool Surface: Plaster

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    boston62's Avatar
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    Re: Mustard Algae

    After reading about black algae here, they might be from fertilizer iron, because I can't scape it off...

    13,000 Gal Pool & Spa
    Jandy Automation /w IAqualink
    Autopilot SWG
    Jandy 2.0 HP VSP, Filter Cartridge
    Taylor (FAS-DPD K-2600, Pool Surface: Plaster

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