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Thread: Questopn on Shock Types

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    Join Date
    May 2008
    Location
    Jackson, NJ
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    38

    Questopn on Shock Types

    I opened my pool recently and purchased some new shock at Home Depot the main ingredient is Trichloro-s-triazinetrione a powder. I had some shock left over from last year which main ingredient is sodium hypochorlite a liquid shock. The Trichloro on the top said do not mix with calcium hypochorite why not and what is that another type of shock? What is the difference between sodium hypochorlite and calcium hypochorite. I never mixed the two I just used the Home Depot one. My other question in the future would it okay to use the liquid shock from last season. Thanks!
    AGP Vinly Liner 18 Ft Round
    Proline Cartridge Filter
    7600 gallons

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    Join Date
    Feb 2010
    Location
    Houston, TX
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    Re: Questopn on Shock Types

    You don't mix different types of chlorine because a dangerous chemical reaction can occur. If you add one, wait to add another type until the first is completely dissolved.

    As for the difference, Trichlor adds CL and CYA, Cal-Hypo adds calcium along with CL, and sodium hypo adds salt and CL. You have to be careful using Trichlor and Cal-Hypo because of the other things they add, which is why the majority here uses sodium hypo (aka bleach).

    Have you read through Pool School yet? If not, start there and read through it. Then read through it again, and if you have any questions about it, feel free to ask! Since I haven't seen you here yet, welcome to TFP!
    John

    24' round Vogue AGP 12,000 gal. Flotec AT251001-01 1HP pump, Hayward S310T2 sand filter, Aquarite SWG T-15
    TF-100 (found at TF Test Kits) with Speedstir and Samplesizer

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    Cupertino, CA
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    Re: Questopn on Shock Types

    "Shock" is a marketing term; it doesn't distinguish one kind of chlorine from another.

    Every pool-chlorine compound adds a little salt as well as chlorine; sodium hypochlorite (bleach/liquid chlorine) and lithium hypochlorite (typically very expensive) are the only kinds that don't add anything else. The amount of salt is small enough that it's not even worth thinking about it.

    Regarding leftover liquid chlorine from last season, it's probably degraded to about half strength at this point but would still be worth something in the pool.
    --paulr
    BBB "Intermediate Swimmer"
    IG plaster pool 18.5K gal, Hayward Pro-Grid DE filter, 3/4 HP Hydramax II; Polaris 380, 3/4 HP booster
    AG spa 325 gal, probably Sundance of some kind
    Water testing instructions on one page

  4. Back To Top    #4

    Join Date
    Feb 2010
    Location
    Houston, TX
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    271

    Re: Questopn on Shock Types

    Quote Originally Posted by PaulR
    "Shock" is a marketing term; it doesn't distinguish one kind of chlorine from another.
    That was the other thing I meant to say!
    Thanks Paul!

    On the subject of that, shocking is not a one time addition of CL either, it's a process!
    John

    24' round Vogue AGP 12,000 gal. Flotec AT251001-01 1HP pump, Hayward S310T2 sand filter, Aquarite SWG T-15
    TF-100 (found at TF Test Kits) with Speedstir and Samplesizer

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