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Thread: Need shocking advice

  1. Back To Top    #1

    Join Date
    Jun 2010
    Location
    Elkridge, MD
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    104

    Need shocking advice

    While I've gotten pretty good at normal BBB maintenance, this past week was a first--I went away for a week with no one attending to my pool. I put a ton of bleach in it (over shock value) before leaving, in hopes that it would last the week, but no such luck. I currently must have a chlorine level of zero. Putting in the dippers of powder doesn't even turn the test pink at all.

    The water in the pool looks perfectly clear, and the filter's been running nonstop.

    I would really like to swim Sunday (it's now Friday evening). As best I can tell, my options are:

    1) Shock the pool by putting in a ton of bleach. While I feel that this is probably the "right" answer, I am worried that this will keep the chlorine levels high enough over the next few days that it wouldn't be healthy to swim.

    2) Shock the pool using Wal-mart stuff. While I have *always* tried to stick to BBB products, I just now bought two bags of HTH "Super Shock 'n Swim". Listed ingredients are calcium hypochlorite 52%, "other ingredients" 48%. The bag recommends using this product weekly. How harmful would it be to my pool to use it once? Would it have as good a shocking effect as all those bottles of bleach?

    3) Put bleach in up to the normal recommended value and forget about it. Can I do this? If I add bleach, run a test tomorrow and find negligible combined chlorine, can I consider it "safe"?

    Thanks in advance for any advice!
    32 x 16 20,000 gallon inground vinyl. Pool Genie filter. BBB seems to be working well so far despite high CYA. Aquabot Turbo T which I adore.

  2. Back To Top    #2
    frogabog's Avatar
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    Jul 2010
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    Portland, Oregon
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    1,578

    Re: Need shocking advice

    Personally... I'd dose to max FC for your CYA level, perform a CC test, if that passes then do the OCLT and call it good if everything passes.

    Going to 0 can't always mean a need to shock, your pool might have just lost the rest of the chlorine shortly before you tested. You don't really know. If no algae has bloomed yet your tests will tell you so.
    Where kids swim in 54 degree water, turn blue, and giggle happily cuz they got a POOL!
    Year 3 BBB -15' x 48" Intex Metal Frame - Was using (2) 1000gph Intex cartridge filters (see Full time pumping Intex). 2012, converted to 1600gph and sand filter+SWG = Sand filter love affair!
    Don't waste time and energy looking for a better value on test kits, the TF100 is the best deal around. I did the looking and spent the extra money, but you don't have to make the same mistake. Just go here: TFTestkits. I use Pool Calculator for min/max, and shocking chlorine levels.

  3. Back To Top    #3
    JasonLion's Avatar
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    May 2007
    Location
    Silver Spring, MD
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    37,879

    Re: Need shocking advice

    How appropriate it is to use cal-hypo depends on your current CH level.

    With the water clear, I would raise the FC level to the high end of the normal range in the early evening, give it a few hours to circulate, and then do an overnight FC loss test. If you lose chlorine overnight, it is time to shock.
    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

  4. Back To Top    #4

    Join Date
    Jun 2010
    Location
    Elkridge, MD
    Posts
    104

    Re: Need shocking advice

    Thanks for the advice. My test results indicate I should probably shock (even though the water looks, smells and feels fine), and my calcium hardness is well within the normal range, so I think this time I'm gonna use the Wal-Mart stuff.
    32 x 16 20,000 gallon inground vinyl. Pool Genie filter. BBB seems to be working well so far despite high CYA. Aquabot Turbo T which I adore.

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