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Thread: Need help: Mustard algae or pollen??

  1. Back To Top    #1

    Join Date
    Jun 2012
    Location
    Folsom, CA
    Posts
    54

    Need help: Mustard algae or pollen??

    Second year pool owner (first year doing on my own).

    Here is the situation:

    I am in Sacramento, CA, have been using that bubble-wrap (clear) to raise the water temperature, and it seems to be working fine. On Saturday, I noticed a very small area on pool floor having some kind of yellowish material..thought it is pollen, scrubbed it away (also pool sweep picked up some). Added liquid chlorine (10%), and also noticed some tiny yellowish stuff on one side of the wall (very small area) of the pool. Scrubbed it away too..After couple of hours, noticed the yellow stuff again on the floor (same spot as first time), but no yellow spots on the wall. So, I am thinking is is Mustard algae?? Read the pool school, and got ready to take charge. Tested the pool, and got the following results (Sunday Morning):

    pH: 8.0
    FC: 3.0 ppm
    CC: Absent
    TA: 90 ppm
    CH: 260 ppm
    CYA: < 30 ppm...
    Borate: 50 ppm

    I started adding chemicals (Sunday morning), and also ran water fall:

    Brought the pH down to ~7.2, raised FC to about 15 or so, added stabilizer to raise the CYA..didn't test it again, but I am thinking it is like 40 or so.

    While adding the chemicals, I scrubbed the pool (walls, floors, etc), and didn't see any yellow material. But then yellow stuff appears again, around 5-6 hours after adding the chemicals, on the floor (same spot as first time), but no yellow spots on the wall, .

    Ran the test again (before going to bed):

    pH: ~ 7.2
    FC: 11.0 ppm
    CC: Absent

    Did the overnight test, tested the water again this morning, and got the following results:

    pH: ~ 7.2
    FC: 10.0 ppm
    CC: Absent

    Yellow patch didn't increase in area over night (at least till I left for work).

    Do I have a problem at hand or it is pollens?? We had high pollen count over the last couple of days (wife suffers from severe allergy, so she keeps track of pollens).

    Can someone help me out...

    Thanks.
    ----------------
    9,700 gallon, in-ground pool, Cartridge filter, Irregular (kidney) shape, Taylor K-2006 test kit, small rock waterfall.

    Pool School + Test Kit + Test Kit Directions +The Pool Calculator = A TROUBLE FREE POOL

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    duraleigh's Avatar
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    Apr 2007
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    Sebring, Florida
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    Re: Need help: Mustard algae or pollen??

    almost surely pollen based on the fact that it reappeared within hours of you adding a significant dose of chlorine.
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  3. Back To Top    #3

    Join Date
    Jun 2012
    Location
    Folsom, CA
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    54

    Re: Need help: Mustard algae or pollen??

    Thanks Dave, but isnt is odd that pollens seem to gather at the same spot??
    ----------------
    9,700 gallon, in-ground pool, Cartridge filter, Irregular (kidney) shape, Taylor K-2006 test kit, small rock waterfall.

    Pool School + Test Kit + Test Kit Directions +The Pool Calculator = A TROUBLE FREE POOL

  4. Back To Top    #4
    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Need help: Mustard algae or pollen??

    Not odd, extremely common. Things like pollen that sink very slowly tend to be deposited in the same spots of the pool every time, based on how the water currents tend to flow in your particular pool.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

  5. Back To Top    #5

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    Jun 2012
    Location
    Folsom, CA
    Posts
    54

    Re: Need help: Mustard algae or pollen??

    Thanks Jason!! Let's hope it is pollen and not algae. Will see how the pool looks in the evening.
    ----------------
    9,700 gallon, in-ground pool, Cartridge filter, Irregular (kidney) shape, Taylor K-2006 test kit, small rock waterfall.

    Pool School + Test Kit + Test Kit Directions +The Pool Calculator = A TROUBLE FREE POOL

  6. Back To Top    #6

    Join Date
    Jun 2012
    Location
    Folsom, CA
    Posts
    54

    Re: Need help: Mustard algae or pollen??

    Update: Pool looked the same when I got home, that yellow stuff was still sitting there and hadn't grown.

    Ran the test again (before going to bed):

    pH: ~ 7.2 (it was dark, so couldn't tell the exact color)
    FC: 8.0 ppm
    CC: Absent

    Did the OCLT, tested the water again this morning, and got the following results:

    pH: 7.4 (Is it normal for pH to rise 0.2 or so units over a day or two?)
    FC: 7.5 ppm
    CC: Absent

    Yellow patch didn't increase in area over night (at least till I left for work)...so I am going to agree with experts here that this looks like pollen..yay
    ----------------
    9,700 gallon, in-ground pool, Cartridge filter, Irregular (kidney) shape, Taylor K-2006 test kit, small rock waterfall.

    Pool School + Test Kit + Test Kit Directions +The Pool Calculator = A TROUBLE FREE POOL

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