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Thread: Just confirming shock reaction is normal

  1. Back To Top    #1

    Join Date
    Jun 2015
    Location
    Los Angeles, CA
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    4

    Just confirming shock reaction is normal

    Hi there,

    I'm currently Slamming my pool (16,500 gal, pebble tech).
    Algae unfortunately got out of control while I was on vacation. Had high CYA as well, so needed to drain partially and re-fill.
    I'm just about 24 hours into the slam process. There is some improvement in the color, but the pool is still quite green. Is that normal after a day of shocking? I was under the impression that the "green hue" would dissipate more rapidly, and while I'd expect cloudiness, the Algae would be dead and gray by now.
    I'm fine with it taking longer (have a few days off to deal with this), but just want to make sure it's normal that it could take a few days, and I'm not missing something.

    Thanks in advance for the help.
    Current test results are:

    CYA 70
    FC 28
    CC 1.5
    Alk 80
    pH (before shock) 7.6

  2. Back To Top    #2
    Mod Squad JVTrain's Avatar
    Join Date
    Feb 2014
    Location
    Central Minnesota
    Posts
    5,079

    Re: Just confirming shock reaction is normal

    There is no definitive timeline for a SLAM because of all the variables involved such as: how bad was the pool? how often will it be tested and dosed? how much brushing is taking place? how good is the filtration? etc...

    It's normal for a SLAM to take a week or more. How long depends on all those variables and ones I didn't mention.

    Also... taking a picture of the same area each day such as by the steps can help you track progress.
    Joel - TFP Moderator - Minnesota - **Become a TFP Supporter!** Helpful Links: ABCs of Pool Water Chemistry - SLAM Procedure - Chlorine/CYA Chart
    40x20 Pool: 32K Gallons * Vinyl * Bleach Chlorination * Hayward S270T Sand Filter * Pentair SuperFlo 1 HP * Teledyne/Laars Heater * AquaVac Tigershark * TF-100 w/ SpeedStir
    Isolated Spa - 345 Gallons

  3. Back To Top    #3

    Join Date
    May 2016
    Location
    Woodbridge, VA
    Posts
    97

    Re: Just confirming shock reaction is normal

    We're just finishing day 3 of slam here and the pool is just now getting more grey/blue than green, and we didn't even start at swamp level. It'll improve every day.
    Kayak 12' x 24' 8600 gallon pool; Vinyl liner; Intex Sand Filter 2800 GPH; TF-100

  4. Back To Top    #4

    Join Date
    Jun 2015
    Location
    Los Angeles, CA
    Posts
    4

    Re: Just confirming shock reaction is normal

    OK,,, thanks for the info and the quick replies!! I'll will keep at it, and hopefully things will start changing soon.
    Fingers crossed.
    Kind regards,
    John

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