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Thread: No Chlorine in my pool

  1. Back To Top    #1

    Join Date
    Jun 2015
    Staten Island, NY

    No Chlorine in my pool

    I can't seem to keep chlorine in my pool. The water has the slight cloudy look. Here are my detail. Please help. Thanks

    14' x 24' inground vinyl pool
    Approx 10,000 gallons
    Jandy Cartridge filter
    Aquarite T9 salt chlorinator set to 40%
    Colorq pro 7 test kit

    FC 0.21
    TC 0.44
    PH 7.4
    ALK 51
    CH 115
    CYA 60
    pool store tested phosphates as good.

    Shocked already 3 times in 2 weeks with about 2 bags each time.

    What am I doing wrong?


  2. Back To Top    #2
    BoDarville's Avatar
    Join Date
    Jun 2012
    DFW, Texas

    Re: No Chlorine in my pool

    The reason you are having difficulty keeping chlorine in the pool is that there is something organic in the pool that is consuming it. The cloudy look is an indicator of that and it could be nascent algae that hasn't gone into full bloom yet.

    Shocked already 3 times in 2 weeks with about 2 bags each time.
    This is the typical "shock" treatment which is completely ineffective. We have a process called the SLAM that you will need to familiarize yourself with and perform in order to clear up your pool.

    So, here's what I recommend: Start by getting yourself one of the Recommended Test Kits. I use the TF-100 because it's the best value and they have a freshness guarantee. You can order it here: They ship fast - you should have it in your hands in 2-3 days with normal shipping. One of the tests it contains is the all-important FAS-DPD test which you will need for the SLAM.

    Second: While you are waiting for the kit, I would check out these short articles to give you an overview of managing a pool using our methods:
    1. ABC's of Pool Water Chemistry
    2. Chlorine CYA Chart - This concept is critical to understand as it governs the amount of chlorine you need according to your CYA levels.
    3. Recommended Pool Chemicals
    4. Recommended Levels
    5. Pool Math

    Finally, do not worry about phosphates. Chlorine and chlorine alone in the proper dose will kill and prevent algae no matter the level of phosphates.
    Gold Supporter, TFP Lifetime Supporter, 26,680 gal Plaster IGP 3.5 - 10' depth / Attached Waterfall Spa, Manually Chlorinated, Triton Sand Filter, 1.5 HP * 1.1 SF = 1.65 SFHP 1-speed Pentair WhisperFlo WF-26 Pump, 400K BTU NG Teledyne Laars Series One Heater, Polaris 360, Test Kit Comparison, Chlorine/CYA Chart, SLAMing Your Pool, OCLT
    A good test kit is an investment, not an expense.

  3. Back To Top    #3

    Join Date
    Jun 2015
    Staten Island, NY

    Re: No Chlorine in my pool

    Thank you for the reply. I already have the Colorq pro 7 test kit. Is this not good enough? Also to get my chlorine up to 28 shock value, about how much chlorine would I need? Would 15 gallons of liquid chlorine be enough?

  4. Back To Top    #4

    In the Industry
    duraleigh's Avatar
    Join Date
    Apr 2007
    Sebring, Florida

    Re: No Chlorine in my pool

    The ColorQ has a bad habit of not being very reliable....particularly on CYA and CH.

    Use to calculate your dosages. It is a very handy tool that may seem just a bit daunting at first.
    Dave S. - Forum owner
    42k vinyl and concrete pool, 1.5hp pump, 140gpm filter
    TFTestkits , PoolMath , Pool School

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