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Thread: Shock after chlorine drop?

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    Shock after chlorine drop?

    Hi, All.

    I'm new to the forum and new to pool ownership. I have an Intex 18' x 48" Ultra Frame with an Intex 2,500 gph filter pump, sand filter, and Krystal Clear salt water generator.

    Here's my issue: My chlorine keeps burning off because my CYA levels are too low. I've been adding stabilizer (granules in a sock in front of the return) for the last two days, shocked last night, running the SWG on boost, but still can't maintain any chlorine--it's been extremely hot and sunny.

    I'd really like to swim tonight, so my question is, do I need to shock again since my FC levels plummeted to 0 during the day or can I just raise to maintenance level?

    I'll test the water as soon as I get home.

    Thanks!

    ** Test results **

    FAC - 0
    TAC - .5
    Salt - 3,000
    CH - 260
    CYA - 50
    TA - 50
    pH - 7
    Base demand - 1
    Copper - 0
    Iron - 0
    Phosphates - 300
    Last edited by MiaRousseau; 07-21-2016 at 06:32 PM. Reason: Update

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    Mod Squad pooldv's Avatar
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    Re: Shock after chlorine drop?

    Welcome to TFP!

    How many ppm of CYA did you add to the pool? And how did you add it? In a sock as shown here, Pool School - Recommended Pool Chemicals

    It is important to maintain chlorine above minimum for your CYA, FC/CYA Chart, to keep the pool safe and sanitary.

    Time for a little reading in Pool School, start here,
    ABCs of Pool Water Chemistry
    And here, Pool School - Getting Started
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    Re: Shock after chlorine drop?

    Hi, yes I added it in a sock in front of the return. I put in a little over a pound.

    I also added my water test results to the original post.

    I've been studying up like crazy during this process.

    Last edited by MiaRousseau; 07-21-2016 at 06:36 PM. Reason: Error

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    duraleigh's Avatar
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    Re: Shock after chlorine drop?

    1 lb of CYA will have little effect on an average pool. How large is yours?
    Dave S.
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

  5. Back To Top    #5

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    Re: Shock after chlorine drop?

    Hi, I listed my specs and test results in the original post. Thanks!

    - - - Updated - - -

    We swam for the first time yesterday evening. I added two cups of bleach after testing. I know I need to add baking soda, but haven't determined how much. The water was clear yesterday, but is cloudy today. The stabilizer in the sock is almost completely dissolved.
    Last edited by MiaRousseau; 07-22-2016 at 09:12 AM. Reason: Error

  6. Back To Top    #6

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    Re: Shock after chlorine drop?

    I added 6 lbs of baking soda and 2 cups of bleach tonight. I'll add another cup of stabilizer granules when the sock is empty. I'm hoping this will get my numbers to the place they should be.

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