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Thread: mustard algae?

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    mustard algae?

    hi brand new user...have read pool school ...ordered tf100 kit today but onlyy have test strips given us from pool store, so my numbers are probably useless CH 0, TOTAL CL 10+ , FREE CL DARKER PURPLE THAN TOP OF 20PPM, PH ALL OVER THE PLACE, TA 100 CYA 0.
    We filled our pool from our pond, it appears we have mustard algae, can i start some treatment before my test kit arrives? our water is clear but yellowish tint...yellow almost rusty looking grime forming on walls and little piles of same on floor, definitely not pollen, vac and scrubbed off yesterday back this am.
    27 ft AG, vinyl 1hp 40 gpm sand filter. 19,300 gal, installed 7/30/13

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    Re: mustard algae?

    Welcome to TFP!

    There is not much that you want to do before your kit arrives, test numbers are crucial to getting it right. The only thing I would think is a good addition is stabilizer, but only if you haven't added anything containing stabilizer yet. Have you added anything to the pool at all? If not then your CYA is actually zero in which case I hope that your chlorine level isn't actually above 20... That you can adjust while you wait for your test kit. Also if you can get a decent reading on your pH you can adjust that a bit with either muriatic acid to reduce it or borax to increase it. After those adjustments you could work on putting your pool in kind of a holding pattern until the kit arrives.

    The rusty tint sounds more like an iron problem than mustard algae. Is there a chance you have iron in your fill water?
    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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    Re: mustard algae?

    Yes we have added 4 gal of shock and pool guy added conditioner but we back washed the filter yesterday.
    We have in total added 8lbs of borax 6 lbs of baking soda also in the last few days. Pool company tested for iron and was fine.
    27 ft AG, vinyl 1hp 40 gpm sand filter. 19,300 gal, installed 7/30/13

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    Re: mustard algae?

    I hate making assumptions so forgive me for asking, the "shock" was liquid, correct?

    Even with backwashing the CYA probably mostly dissolved, do you know how much was put in? If you know that we can guesstimate your CYA level and you can add a small amount of chlorine to try to prevent further growth. You want to hold off any major adjustments or SLAMing until you get your kit and accurate test results.
    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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    Re: mustard algae?

    our water is clear but yellowish tint...yellow almost rusty looking grime forming on walls and little piles of same on floor, definitely not pollen, vac and scrubbed off yesterday back this am
    Despite the pool stores test, that is almost surely iron in your pool water from the well.

    Keep vacuuming it out every day.

    Until your test kit gets to you, I would suggest you add roughly 1 gallon of Clorox each evening. That should keep algae at bay until you can post some meaningful test results.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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    Re: mustard algae?

    Yes our shock was liquid....4 lbs of cya were added on Thursday
    27 ft AG, vinyl 1hp 40 gpm sand filter. 19,300 gal, installed 7/30/13

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    Re: mustard algae?

    Just got back from walmart ,our numbers from hth 6drop are cl off scale high ph 7.5. Cya 30. TA90. TH 70
    27 ft AG, vinyl 1hp 40 gpm sand filter. 19,300 gal, installed 7/30/13

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    Re: mustard algae?

    ok update: received tf 100 test kit
    results were all pretty good chlorine was high enough where i was probably slamming it the whole time while waiting for the kit. I left alone and monitored chlorine a couple of days . yesterdays test results FC 4.5, CC 1.5, TA 120, CYA between 30 AND 40, ph 7.3. I then read a bunch of posts on this forum and decided a slam couldnt hurt so started one yesterday..... i'll attach pics of the stuff forming on our skimmer lid and a shot of the yellow tinted water.
    Attached Images Attached Images
    27 ft AG, vinyl 1hp 40 gpm sand filter. 19,300 gal, installed 7/30/13

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    Re: mustard algae?

    Any suggestions is it algae or iron? Any advice appreciated
    27 ft AG, vinyl 1hp 40 gpm sand filter. 19,300 gal, installed 7/30/13

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    Re: mustard algae?

    Maybe some of both, but with a CC of 1.5 SLAMing is what's called for. Once you get past that we can work on any staining.
    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: mustard algae?

    Slam done Oclt <1 cc .5. Is it safe to swim in 14.5 ppm FC?
    27 ft AG, vinyl 1hp 40 gpm sand filter. 19,300 gal, installed 7/30/13

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    Re: mustard algae?

    With CYA of 40 or so, it is fine.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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