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Thread: Pool Drinks Chlorine

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    Pool Drinks Chlorine

    You site is very helpful. I like the idea of using common household products rather than overpriced pool store products.
    I am completely new to pool care. My pool has been set up for about two weeks now. I have been trying to follow the BBB method. At the present time I don't have any problems, but I can't get consistent readings. The water is clear, no smell and doesn't burn your eyes or skin. Without being able to get consistent readings, I feel that I am flying blind. Since opening I have added about 4.5 containers of 8.2% chlorine bleach. In addition I have added 2lbs of granular stabilizer 1lb at a time. These are the readings I got the morning after I added the last quart of chlorine.

    FC - 1.5
    TC - 1.5
    CC - 0 to .5
    PH - 7.8
    TA - 150
    CH - 90
    CYA - 30+ (max scale, cloudy but could still see black dot)
    Temp 84F

    Using Taylor K-2005 test set.

    Pool is in direct sunlight. In addition, since filling we have had quite a bit of rain. One day had to drain off 2" because it was over the level of the skimmer. Did additional test the next evening. FC-0 TC-0 PH-7.8
    Any help would be greatly appreciated. I don't want to deal with algae.
    21' x 52" AGP 10,405 gal vinyl, sand filter, 1hp pump, pool filled 11 Aug 2011,

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    Mod Squad jblizzle's Avatar
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    Re: Pool Drinks Chlorine

    Welcome to TFP!!!

    The first thing I notice is that you do not have one of the recommended test kits. You want the K-2006. You can add the all important FAS-DPD chlorine test and then have the equivalent: http://tftestkits.net/FAS-DPD-Chlorine- ... t-p47.html

    If you are filling the CYA tube to the top and still see the dot, then the CYA is < 30ppm. Using the poolcalculator.com that 2 pounds should have added 23ppm. Adding some more CYA will better protect the FC from the sun. I would suggest adding another pound.

    Also, your FC is too low, you should never let it get below 2ppm: pool-school/chlorine_cya_chart_shock

    Since you FC went below the minimum and to 0ppm, algae is highly likely. I would elevate the FC up to around 10ppm now and let it drift back down and maintain it > 2ppm. Once you get the FAS-DPD, then you can Perform the Overnight Chlorine Loss Test to see if anything is growing in the water that would require the SLAM Process.
    Jason, TFP Moderator
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    Re: Pool Drinks Chlorine

    After following your instructions I get the following readings the next evening.
    FC- 1-2
    CC- 1-2
    PH- 7.6
    TA- 120
    CH-70
    CYA- 58
    Temp- 86f

    I am using 8.2% bleach. How much should I add?
    Thank you for your help and quick reply.
    21' x 52" AGP 10,405 gal vinyl, sand filter, 1hp pump, pool filled 11 Aug 2011,

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    Mod Squad jblizzle's Avatar
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    Re: Pool Drinks Chlorine

    Which instructions did you follow? It is not possible for your CYA to suddenly jump by 30ppm ... if you add granular CYA it takes up to a week to show up on the test, so one or both of your tests are invalid.

    I have no idea what you goal is or what your CYA is, so i have no idea how much bleach to recommend. Plus you do not have the appropriate kit to measure the FC > 5ppm anyway.

    You can use poolcalculator.com to determine how much bleach to add. But, if you do not understand the chemistry, you should read Pool School first.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
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    Re: Pool Drinks Chlorine

    I added 1lb of stabilizer and brought the fc up to 10ppm as you suggested. The readings are what I got the following night. I have read everything in the pool school many times, and have tried to follow the instructions. My goal is to get readings stable enough to use the calculator for my chemical quantities. I bought my test kit prior to finding this site but do plan to order the one test that is not in my test set. Thanks
    21' x 52" AGP 10,405 gal vinyl, sand filter, 1hp pump, pool filled 11 Aug 2011,

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    Mod Squad jblizzle's Avatar
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    Re: Pool Drinks Chlorine

    You CYA results are very puzzling. Are you doing the test outside with your back to the sun and the tube at waist level?

    Dropping from ~10ppm to 1-2ppm in one day is pretty excessive, so either the CYA is much lower than you think or there is something in the water. Wehn you get the FAS-DPD test, you should probably SLAM the pool.
    Jason, TFP Moderator
    18k IG pebblesheen pool, Hayward ProLogic P4 w/ T-15 SWG, Pentair 1HP 2-speed Superflo, Hayward 6020 DE filter
    500 sqft Heliocol solar panels, ThePoolCleaner, TF-100 test kit w/ SpeedStir
    Pool School + Test Kit + PoolMath = A TROUBLE FREE POOL
    If you found TFP helpful and we saved you money ... Become a TFP Supporter!

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    gatorbrit's Avatar
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    Re: Pool Drinks Chlorine

    Always worth doing an OCLT. Just to make sure that there is no organics eating chlorine that perhaps aren't showing up in the CC test.
    18k vinyl IGP, Sand Filter, EasyTouch Control Sys, Pentair Intelliflo, Intellichlor IC 40 SWG, Rheem Heat Pump.

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