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Thread: Cloudy water...need a little more guidance...

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    Join Date
    May 2007
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    New Jersey
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    Cloudy water...need a little more guidance...

    Hello,

    Fiberglass pool owner here and thrilled with my pool. I have the Taylor 2006k test kit and have had wonderful pool water all summer. Then to get rid of a few areas of staining I used ascorbic acid to treat the stain. During this time we received 5 days of rain in NJ. Well I developed algae in a yellowish form lightly in areas around the pool. My chlorine has definately flucuated over the past few days but had company yesterday so didnt want it that high. The pool was clear from looking into it but with goggles very cloudy than normal. Last evening I put my SWG to 100% and added bleach to get to 9 FC that was about 6pm. At 12am FC was 8 (assume chlorine being consumed up). This morning 8am FC 10 with CC=0 but those yellow areas appear again in small amounts on edges of built in seats and swimouts. They come right off with a finger or brush. I have followed Mbars posts for fiberglass pool and others as well and it has helped alot...I just want confirmation that I am heading in the right direction to clearing up the pool. Thanks for the support at this site...its wonderful.

    I assume I just need to continue to filter. What should I try to hold my FC level at? My filter psi has only risen 2 psi in the last 20 hours from 12 to 14 (avg is 11-12psi). My number for the pool are posted below.

    FC = 10
    CC = 0
    PH = 7.2
    Alk = 110
    CYA = 40

    Thanks.

    Ls
    14 x 32 Fiberglass Pool 10K gal. Hayward Pump and Sand Filter. Autopilot SWG Dig 48 and Heat Siphon 3.25sx Heat Pump.

    The Pool Calculator
    Chlorine/CYA Chart by Chemgeek

  2. Back To Top    #2
    JasonLion's Avatar
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    May 2007
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    With a CYA of 40 shock level for your pool would be 15. If that is mustard algae, which it sounds like, then you may need to go higher than that to get rid of it permanently. Levels around FC of 24 for 24 hours after FC holds overnight are suggested for completely getting rid of mustard algae. It also helps to brush the entire pool while the chlorine level is high.
    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

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    duraleigh's Avatar
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    Ls,

    I would reemphasize what Jason said about brushing. I fight mustard algae each year (thru neglect...please don't tell anyone ) and I find that high FC is the cure but brushing speeds the process noticeably and effectively.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  4. Back To Top    #4
    Quote Originally Posted by duraleigh
    I fight mustard algae each year (thru neglect...please don't tell anyone

    oooohhhh...... I'm gonna tell


    8000 gallon 20' x 48" round vinyl frame pool, 12" sand filter (don't have the specs on the pump), TF100 test kit
    Handy Links: PoolMath, TF-100 Test Kit, Pool School, CYA-Chlorine Chart
    "Shock" is a process, not a product!

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    gonefishin's Avatar
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    Apr 2007
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    Quote Originally Posted by duraleigh
    Ls,

    I would reemphasize what Jason said about brushing. I fight mustard algae each year (thru neglect...please don't tell anyone ) and I find that high FC is the cure but brushing speeds the process noticeably and effectively.

    Hi duraleigh,

    If that's the case...would you be able to send me a sample? Collecting it is easy enough...although you do have to approach it quite slowly. It would be great if Matt4x4 and yourself would be able to send samples.

    thanks,
    dan
    21' Aqua-Leader AGP (10,200 gallons).
    Hayward cartridge filter and two speed pump.
    Aqua-Cal HeatWave 100k (HeatPump)
    Salt 3200ppm (in non-salt water pool)
    Borates 20ppm (slowly raising)
    Aqua-Rite SWG

  6. Back To Top    #6

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    Sorry, Dan, but thanks to my meticulous pool maintenance and careful, diligent application of chlorine (yeah, right) all the little mustard critters are dead as doornails and long gone some weeks ago.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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