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Thread: Yellow mustard/Cloudy/unbalanced pH

  1. Back To Top    #1

    Join Date
    Jul 2015
    Northern IL

    Question Yellow mustard/Cloudy/unbalanced pH

    Ok... So we had yellow mustard algae. The water was cloudy, there was yellow climbing the walls, and spats of yellow "gunk" throughout the floor of the pool. We pulled the stairs out and cleaned and scrubbed them. We slammed the pool for about 11 days (continuously vacuuming and scrubbing) and there was still yellow going up the walls and the water was still cloudy. My husband purchased "yellow out" from Leslies. He raised the pH to the recommended level and used the "yellow out". Within 24 hours the yellow was gone but it was still cloudy. So we continued to SLAM for about 4 more days until the water was clear and the overnight FC test was achieved. The pH was low so we raised it. Within 2 days, the pH was low again. We raised it again. The water became cloudy again and there are spats of gunk (can't tell the color) on the floor again. And the pH is low again. Any ideas or suggestions? Do we need to SLAM again first, then worry about the pH? Starting to feel lost.
    15 x 30 above ground, SunRunner sand filter, SunRunner 1.5HP SPL Pool Pump
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  2. Back To Top    #2

    TFP Guide
    needsajet's Avatar
    Join Date
    Jan 2016
    Sydney, NSW, Australia

    Re: Yellow mustard/Cloudy/unbalanced pH

    I'm not experienced with Yellow Out, but here's the MSDS for anyone else who comes along:

    Here's two articles you might find handy in the meantime...
    Pool School - Mustard Algae
    Pool School - Defeating Algae
    12k IG salt; glass beads in plaster; K-2006C, K-1766 Salt, CCL, and Aussie 4in1 (HTH); Pentair Eco800 VS; Zodiac SWC 1.3 lb/day (25 g/hr); 25" filter recycled glass; OKU solar panels; 1/2 HP solar pump; Pentair Rebel pool cleaner; FlowViz flow meter; prior pool AG 10k - Be Safe - FC / CYA Chart - Become a TFP Supporter - Read Before Posting

  3. Back To Top    #3
    Mod Squad Texas Splash's Avatar
    Join Date
    Jun 2014
    South-Central Texas, Marion/San Antonio

    Re: Yellow mustard/Cloudy/unbalanced pH

    I would also recommend sharing a full set of test results and perhaps try to upload a pic or two of this yellow stuff you are seeing. It may help the crowd here as we advise you better.
    Pat (a.k.a. Texas Splash) ~ My Pool: Viking Fiberglass; 17,888 Gal; Waterway Supreme 2-sp/2-hp pump; Hayward Ctg filter; TF-100 w/ Speed Stir
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