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Thread: Yellow Algae

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    cood60's Avatar
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    Yellow Algae

    I keep vacilating on what to do about a yellow "film/dust" that accumulates on seams and creases, mostly on the opposite side of the returns.
    I was going to do yellow algae shock ie 40ppm shock
    But the overnight FC Loss test showed under 1 as FC loss, CC was at .5 or lower, and water was clear, so I am not sure what the yellow stuff is.
    The yellow dust has multplied over night so I need to nip it The water is still fairly clear unless I brush the yellow stuff. But the yellow stuff is all over the bottom though thicker is some places

    Here are my levels
    FC 8 (I got scared because my fc dropped to 1.5 so I added bleach)
    CC .5
    TC 8.5
    ph 7.6
    CYA 60 Had dropped to 30 a few days ago so I raised it. I added raise fc to 8 at that time because it had dropped to 1.5 over night
    TA 70 (pool store says it is 100!)
    CH 140
    Salt 2700
    Phosphate 600 (according to pool store, I do not have that test)

    Pool store says 40 ppm will fade my liner and say I should use 30ppm then add Banish Agecide thew next day
    I am wondering if I go ahead and do the Algecide, will it hurt anything or cause any additional issues? Like having to use it the rest of my life

    How long does it take for the 40+ ppm to reduce to 5ppm?

    What is the highest ppm of chlorine allowable to swim in?

    Will 40ppm fade my liner?

    Is there any downside to using an algecide instead? ie will using that mean I have to keep using it from now on?

    If I do the high chlorine shock treatment, this is my current understanding of the method with some questions:

    Vac to waste
    Reduce Ph to 7.2
    remove lights and ladder and skimmer doors
    Raise FC to 40ppm, my CYA is 60-70 (I just raised it as it had fallen to around 30)
    Should I keep pump running on high the entire time?
    Put all the pool toys and tools and swimwear in the pool
    How long should the FC be above the min level (5 for me)
    How long does it take for the FC levels to be reduced to normal
    Some say the Fc should never be abobe 4 ppm for swimming?
    Should the SWG be off during this treatment?
    Thanks for advice
    22'x40' IG, Freeform, 26K gal, Vinyl liner pool(2011), three returns plus two step jets, one slide, two skimmers, two LED lights, Stamped Concrete with Aqua PL-Plus Automation panel, Pentair Intelliflo VS, Hayward Pro Series High Rate Sand Filter 500lb, Hayward Turbo Cell T-Cell 15 (SWG) Smart Pool Scrubber60 Robotic Pool Vac.

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    Re: Yellow Algae

    Wow! I can't answer all those questions but I will say if it was my pool I would simply read "How to Shock Your Pool" up in Pool School and follow that PRECISELY.

    You are blending advice from the pool store with advice from the forum and they seldom match and you end up in the middle.

    I see no reason to shock your pool so high since I can't find anything in your post that says you have shocked it correctly yet.

    Shock is a process that requires you to maintain shock value (20ppm) for a period of days until your pool is crystal clear. Read that article and you'll be on your way.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    cood60's Avatar
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    Re: Yellow Algae

    Thanks. I did read and re-read all the shocking articles. The reason for the 35-40ppm is because the that is what the pool school recommends for Yellow Algae shocking as per the CYA chart and or 60% of CYA ie a CYA of 60 would require 36ppm, 70 would require 42. I added some water to help dilute (and prepare for vac to waste, hoefully will lower cya a bit

    Thanks for the quick reply
    22'x40' IG, Freeform, 26K gal, Vinyl liner pool(2011), three returns plus two step jets, one slide, two skimmers, two LED lights, Stamped Concrete with Aqua PL-Plus Automation panel, Pentair Intelliflo VS, Hayward Pro Series High Rate Sand Filter 500lb, Hayward Turbo Cell T-Cell 15 (SWG) Smart Pool Scrubber60 Robotic Pool Vac.

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    Re: Yellow Algae

    I think you may still have missed the part about holding and constantly replenishing the FC at shock value until the pool is crystal clear.

    Going to 40ppm and following the process for mustard algae is fine if you want to do that I do not believe it's necessary in your case) but it will still require that you HOLD the FC at 40 for perhaps days....not a one time dose.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: Yellow Algae

    Don't forget the part about getting behind light niches and under removable ladders, if applicable. If the area where the yellow dust is settling isn't the shady side of the pool, then it's probably not yellow/mustard algae -- it really doesn't like direct sunlight.
    16,000 gallon outdoor in-ground 16'x32' plaster pool; Pentair Intelliflo VF pump; Pentair IntelliTouch i9+3s control system; Jandy CL-340 square foot cartridge filter
    12 Fafco solar panels; Purex Triton PowerMax 250 natural gas heater (200,000 BTU/hr output); automatic electric pool safety cover; 4-wheel pressure-side "The Pool Cleaner"

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    cood60's Avatar
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    Re: Yellow Algae

    Thanks to Dave and Chem Geek
    Have removed ladder and lights and cleaned, am in the middle of it now
    Interesting about the mustard algae not likely growing on the direct sunlight side ...it is both sides and I hope it is not mustard...now that there is more of it, it does seem to have a green tint to it.
    So that should take a normal shock amount, right?
    22'x40' IG, Freeform, 26K gal, Vinyl liner pool(2011), three returns plus two step jets, one slide, two skimmers, two LED lights, Stamped Concrete with Aqua PL-Plus Automation panel, Pentair Intelliflo VS, Hayward Pro Series High Rate Sand Filter 500lb, Hayward Turbo Cell T-Cell 15 (SWG) Smart Pool Scrubber60 Robotic Pool Vac.

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    Mod Squad Bama Rambler's Avatar
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    Re: Yellow Algae

    You can certainly shock if you want, but if you passed the OCLT and your water is clear except for the dust I'd believe it isn't algae. Can you pick up some of it and rub it between your fingers? If it's algae, it'll be slimy. Then rub some of it on a white paper.
    Dave J. TFP Moderator
    24' x 52" Round AGP. 2hp/¼hp SPL Power-Flo 2-speed pump. 200sqft Waterway Cartridge Filter. 45MHP2(3GPD) Stenner Peristaltic Pump
    Pool School ----- Pool Math ----- TF-Test Kit

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    Re: Yellow Algae

    I'm curious as to how your CYA dropped to 30? Did you remove half of your water? CYA doesn't disipate, the only way to get rid of it is to remove water.
    Mona SE MN
    24' round 48" high AG
    Meteor Sand Filter
    1.5 HP pump

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    cood60's Avatar
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    Re: Yellow Algae

    No, not half but maybe 12" as it rained torrentially the last month or so, I am baffled by the loss, esopecially since I raised it to 70 and then 3 weeks later it is 50 without any water removal. I will be paying a lot more attention to CYA levels and aslo how much water I add. I have to rebalance soon as I am in the middle of the famous algae shock process. The folks on this site have been so helpful and ecouraging.
    22'x40' IG, Freeform, 26K gal, Vinyl liner pool(2011), three returns plus two step jets, one slide, two skimmers, two LED lights, Stamped Concrete with Aqua PL-Plus Automation panel, Pentair Intelliflo VS, Hayward Pro Series High Rate Sand Filter 500lb, Hayward Turbo Cell T-Cell 15 (SWG) Smart Pool Scrubber60 Robotic Pool Vac.

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