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Thread: Shocking for Mustard Algae

  1. Back To Top    #1

    Join Date
    Aug 2008
    Lufkin, Texas

    Shocking for Mustard Algae

    Ok guys- I have now got a pretty clear pool since I have been shocking for mustard algae. The fc level is over 20 and from what the Pool School says I need to keep it that way for 24 hours. I am in my first 4 hours of the mustard algae level shock program.
    My question is- what do I do about the CYA level? It is now back down to almost 0. Ph level is about 8.
    Sure need your help and thanks so much!
    Above Ground Pool, hard sided 2017
    7800 gallons
    sand filter

  2. Back To Top    #2
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Shocking for Mustard Algae

    Ignore the PH while at shock level. Test and adjust PH once FC comes down to normal levels.

    You want CYA between 30 and 50 (higher for a SWG pool). With CYA down near zero you are going to lose chlorine to sunlight extremely quickly. You should raise CYA up to around 30 for now, and then raise it the rest of the way when you are done shocking.
    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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